Eec Version Iv Diagnostic Codes And Meanings Options

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EEC Version IV Diagnostic Codes


EEC-IV code
Test Type
Meaning
Problem

11
Both
System Pass
Nothing is wrong with the electronic system. If there is a problem, chances
are it's mechanical.

12
KOER
System cannot raise engine speed
Check the IAC valve. It may be stuck or sticking.

13
KOER
Idle RPM out of specification
Idle is either too low or too high.

14
KOER
Intermittent loss of PIP signal
PIP or ignition module may be malfunctioning.

15
KOER
Failure in ECA assembly
There is a problem with the Keep Alive Memory. Basically, you need a new
ECA.

16 or 17
KOER
RPM too low to run EGO test
The RPM is low causing the EGO sensor to sense rich. It can also be caused
by an adjustable fuel pressure regulator set too high. If this is the case,
reduce fuel pressure.

18
Both
Loss of TACH signal to ECA
Check the SPOUT connector.

19
KOEO
Failure in ECA assembly
There is a problem with the internal voltage regulator. Basically, you need
a new ECA.

21
Both
ECT sensor out of range
Engine coolant wasn't brought up to normal operating temperature or ECT
sensor is bad.

22
KOEO
MAP or BP sensor out of range
MAP or BP sensor is bad.

KOER
MAP or BP sensor out of range
MAP/BP sensor is bad, or there is a vacuum leak.

23
Both
TP sensor out of range
TPS is either missadjusted or bad.

24
Both
ACT or VAT sensor out of range
ACT or VAT sensor is bad, or really dirty.

26
Both
MAF or VAF sensor out of range
MAF/VAF sensor is bad, really dirty, or not calibrated correctly (MAF).

27
Both
VSS signal voltage is too low
VSS is bad.

28
Both
VAT sensor out of range
VAT sensor is bad, or really dirty.

29
Both
VSS signal voltage is too low
VSS is bad.

31 or 32
Both
EVP sensor out of range
EGR is sticking or EVP is bad.

33
KOER
EVP sensor indicates EGR is not opening properly
EGR is bad, EVP is bad, and/or there is a vacuum leak.

34 or 35
Both
EVP sensor out of range
EGR is sticking or EVP is bad.

41
KOEO
Right EGO failure
EGO is bad, not connected, or missing.

KOER
EGO indicates right bank lean
EGO is going bad, missing, or fuel pressure regulator is set too low.

42
KOER
EGO indicates right bank rich
EGO is going bad, fuel pressure regulator is set too high, or exhaust leak.

44
KOER
Right Thermactor Air System problem
Right Thermactor Air Control system switch is bad.

45
KOER
Thermactor air flow is always upstream
Related Thermactor switch is bad or vacuum leak in related vacuum lines.

46
KOER
Thermactor Air System unable to bypass air
Related Thermactor switch is bad or there is a vacuum leak in the line going
to the valve closest from the smog pumps air output.

51
KOEO
ECT sensor out of range
ECT sensor is bad.

53
KOEO
TP sensor out of range
TP sensor is stuck/sticking or just plain bad. It would be a good idea to
get a replacement.

54
KOEO
ACT sensor out of range
ACT sensor is really dirty or bad.

56
KOEO
MAF sensor out of range
MAF sensor is bad, really dirty, or not calibrated correctly. This code can
also come up with a blow-through forced induction system (like Prochargers).
Pro-M mass-airs will work with blow-though systems.

61
KOEO
ECT sensor is out of range
ECT sensor is bad or wire is grounded.

63
KOEO
TP sensor out of range
TP sensor is bad.

64
KOEO
ACT sensor out of range (signal voltage too low)
ACT sensor is bad or wiring is grounded.

66
Both
MAF sensor out of range (signal voltage too low)
MAF sensor is bad or not calibrated correctly.

67
KOEO
NDS circuit open
NDS is bad or wires are bad.

74
KOER
BOO switch not detected
Brake was not depressed when suppose to or BOO is bad.

75
KOER
BOO switch always closed circuit
BOO is stuck/sticking or is bad.

77
KOER
Operator error
Operator didn't execute WOT when told to during self test.

79
KOEO
A/C on during self test.
Turn A/C off for self test.

81
KOEO
TAD circuit failure
TAD is bad or circuit is bad.

82
KOEO
TAB circuit failure
TAB is bad or circuit is bad.

84
KOEO
EGR vacuum solenoid circuit failure
EGR vacuum solenoid is bad or circuit is bad.

85
KOEO
CANP solenoid circuit failure
CANP solenoid is bad or circuit is bad.

87
KOEO
Fuel pump relay circuit failure
Bad fuel pump relay or FP circuit is bad.

91
KOER
EGO indicates left bank lean
EGO is going bad, fuel pressure regulator is set too low, or bad left bank
injector(s).

92
KOER
EGO indicates right bank lean
EGO is going bad, fuel pressure regulator is set too low, or bad right bank
injector(s).

94
KOER
Thermactor Air System problem on right bank
Air passages for Thermactor Air System on the right side is clogged or right
EGO is going bad.

95
KOEO
FPM signal indicates circuit failure
FPM senses fuel pump voltage is out of range.

96
KOEO
Fuel pump secondary circuit failure
FP secondary circuit is bad or fuel pump relay is bad.

98
KOER
ECA system problem; operating in FMEM
This is the dreaded "limp-mode". Extensive problems are what normally trip
this code. Additional codes will be present with this code.



Glossary:

ACT
Air Charge Temperature sensor

BOO
Brake On/Off switch

BP
Barometric Pressure sensor

CANP
CANister Purge solenoid

ECA
Engine Control Assembly - also known as an ECM (Engine Control Management)

ECT
Engine Coolant Temperature sensor

EEC-IV
Electronic Engine Control system, version 4

EGO
Exhaust Gas Oxygen sensor - also known as an O2 sensor

EGR
Exhaust Gas Recirculation

EVP
EGR Valve Position sensor

FMEM
Failure Management and Effects Mode

FP
Fuel Pump relay

FPM
Fuel Pump Monitor

IAC
Idle Air Control

MAF
Mass Air Flow sensor

MAP
Manifold Air Pressure sensor

NDS
Neutral Drive Switch - also known as a Neutral Safety Switch

PIP
Profile Ignition Pick-up

SPOUT
SPark OUTput

TAB
Thermactor Air Bypass solenoid

TAD
Thermactor Air Diverter solenoid

TP
Throttle Position sensor - also known as TPS

VAF
Vain Air Flow sensor

VSS
Vehicle Speed Sensor


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1994 PCED OBD I A SECTION 3A: EEC-IV Engine Supplement—Car

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3-Digit EEC-IV Diagnostic Trouble Code (DTC) Definitions — Passenger Car
DIAGNOSTIC TROUBLE CODES DEFINITIONS
111 System Pass
112 Intake Air Temp (IAT) sensor circuit below minimum voltage/ 254°F indicated
113 Intake Air Temp (IAT) sensor circuit above maximum voltage/ -40°F indicated
114 Intake Air Temp (IAT) higher or lower than expected
116 Engine Coolant Temp (ECT) higher or lower than expected
117 Engine Coolant Temp (ECT) sensor circuit below minimum voltage/ 254°F indicated
118 Engine Coolant Temp (ECT) sensor circuit above maximum voltage/ -40°F indicated
121 Closed throttle voltage higher or lower than expected
121 Indicates throttle position voltage inconsistent with the MAF sensor
122 Throttle Position (TP) sensor circuit below minimum voltage
123 Throttle Position (TP) sensor circuit above maximum voltage
124 Throttle Position (TP) sensor voltage higher than expected
125 Throttle Position (TP) sensor voltage lower than expected
126 MAP/BARO sensor higher or lower than expected
128 MAP sensor vacuum hose damaged/disconnected
129 Insufficient MAP/Mass Air Flow (MAF) change during dynamic response test KOER
136 Lack of Heated Oxygen Sensor (HO2S-2) switch during KOER, indicates lean (Bank #2)
137 Lack of Heated Oxygen Sensor (HO2S-2) switch during KOER, indicates rich (Bank #2)
139 No Heated Oxygen Sensor (HO2S-2) switches detected (Bank #2)
141 Fuel system indicates lean
144 No Heated Oxygen Sensor (HO2S-1) switches detected (Bank #1)
157 Mass Air Flow (MAF) sensor circuit below minimum voltage
158 Mass Air Flow (MAF) sensor circuit above maximum voltage
159 Mass Air Flow (MAF) higher or lower than expected
167 Insufficient throttle position change during dynamic response test KOER
171 Fuel system at adaptive limits, Heated Oxygen Sensor (HO2S-1) unable to switch (Bank #1)
172 Lack of Heated Oxygen Sensor (HO2S-1) switches, indicates lean (Bank #1)
173 Lack of Heated Oxygen Sensor (HO2S-1) switches, indicates rich (Bank #1)
175 Fuel system at adaptive limits, Heated Oxygen Sensor (HO2S-2) unable to switch (Bank #2)
176 Lack of Heated Oxygen Sensor (HO2S-2) switches, indicates lean (Bank #2)
177 Lack of Heated Oxygen Sensor (HO2S-2) switches, indicates rich (Bank #2)
179 Fuel system at lean adaptive limit at part throttle, system rich (Bank #1)
181 Fuel system at rich adaptive limit at part throttle, system lean (Bank #1)
184 Mass Air Flow (MAF) higher than expected
185 Mass Air Flow (MAF) lower than expected
186 Injector pulsewidth higher than expected (with BARO sensor)
186 Injector pulsewidth higher or MAF lower than expected (without BARO sensor)
187 Injector pulsewidth lower than expected (with BARO sensor)
187 Injector pulsewidth lower or MAF higher than expected (without BARO sensor)
188 Fuel system at lean adaptive limit at part throttle, system rich (Bank #2)
189 Fuel system at rich adaptive limit at part throttle, system lean (Bank #2)
193 Flexible Fuel (FF) sensor circuit failure
211 Profile Ignition Pickup (PIP) circuit failure
212 Loss of Ignition Diagnostic Monitor (IDM) input to PCM/SPOUT circuit grounded
213 SPOUT circuit open
214 Cylinder Identification (CID) circuit failure
215 PCM detected coil 1 primary circuit failure (EI)
216 PCM detected coil 2 primary circuit failure (EI)
217 PCM detected coil 3 primary circuit failure (EI)
218 Loss of Ignition Diagnostic Monitor (IDM) signal-left side (dual plug EI)
219 Spark timing defaulted to 10 degrees-SPOUT circuit open (EI)
221 Spark timing error (EI)
222 Loss of Ignition Diagnostic Monitor (IDM) signal-right side (dual plug EI)
223 Loss of Dual Plug Inhibit (DPI) control (dual plug EI)
224 PCM detected coil 1, 2, 3 or 4 primary circuit failure (dual plug EI)
225 Knock not sensed during dynamic response test KOER
226 Ignition Diagnostic Module (IDM) signal not received (EI)
232 PCM detected coil 1, 2, 3 or 4 primary circuit failure (EI)
238 PCM detected coil 4 primary circuit failure (EI)
241 ICM to PCM IDM pulsewidth transmission error (EI)
244 CID circuit fault present when cylinder balance test requested
311 AIR system inoperative during KOER (Bank #1 w/dual HO2S)
312 AIR misdirected during KOER
313 AIR not bypassed during KOER
314 AIR system inoperative during KOER (Bank #2 w/dual HO2S)
326 EGR (PFE/DPFE) circuit voltage lower than expected
327 EGR (EGRP/EVP/PFE/DPFE) circuit below minimum voltage
328 EGR (EVP) closed valve voltage lower than expected
332 Insufficient EGR flow detected (EGRP/EVP/PFE/DPFE)
334 EGR (EVP) closed valve voltage higher than expected
335 EGR (PFE/DPFE) sensor voltage higher or lower than expected during KOEO
336 Exhaust pressure high/EGR (PFE/DPFE) circuit voltage higher than expected
337 EGR (EGRP/EVP/PFE/DPFE) circuit above maximum voltage
338 Engine Coolant Temperature (ECT) lower than expected (thermostat test)
339 Engine Coolant Temperature (ECT) higher than expected (thermostat test)
341 Octane adjust service pin open
381 Frequent A/C clutch cycling
411 Cannot control RPM during KOER low RPM check
412 Cannot control RPM during KOER high RPM check
415 Idle Air Control (IAC) system at maximum adaptive lower limit
416 Idle Air Control (IAC) system at upper adaptive learning limit
452 Insufficient input from Vehicle Speed Sensor (VSS) to PCM
453 Servo leaking down (KOER IVSC test)
454 Servo leaking up (KOER IVSC test)
455 Insufficient RPM increase (KOER IVSC test)
456 Insufficient RPM decrease (KOER IVSC test)
457 Speed control command switch(s) circuit not functioning (KOEO IVSC test)
458 Speed control command switch(s) stuck/circuit grounded (KOEO IVSC test)
459 Speed control ground circuit open (KOEO IVSC test)
511 PCM Read Only Memory (ROM) test failure KOEO
512 PCM Keep Alive Memory (KAM) test failure
513 PCM internal voltage failure (KOEO)
519 Power Steering Pressure (PSP) switch circuit open KOEO
521 Power Steering Pressure (PSP) switch circuit did not change states KOER
522 Vehicle not in PARK or NEUTRAL during KOEO/PNP switch circuit open
524 Low speed fuel pump circuit open—battery to PCM
525 Indicates vehicle in gear/A/C on
527 Park/Neutral Position (PNP) switch circuit open—A/C on KOEO
528 Clutch Pedal Position (CPP) switch circuit failure
529 Data Communication Link (DCL) or PCM circuit failure
532 Cluster Control Assembly (CCA) circuit failure
533 Data Communication Link (DCL) or Electronic Instrument Cluster (EIC) circuit failure
536 Brake On/Off (BOO) circuit failure/not actuated during KOER
538 Insufficient RPM change during KOER dynamic response test
538 Invalid cylinder balance test due to throttle movement during test (SFI only)
538 Invalid cylinder balance test due to CID circuit failure
539 A/C on/Defrost on during Self-Test
542 Fuel pump secondary circuit failure
543 Fuel pump secondary circuit failure
551 Idle Air Control (IAC) circuit failure KOEO
552 Secondary Air Injection Bypass (AIRB) circuit failure KOEO
553 Secondary Air Injection Diverter (AIRD) circuit failure KOEO
554 Fuel Pressure Regulator Control (FPRC) circuit failure
556 Fuel pump relay primary circuit failure
557 Low speed fuel pump primary circuit failure
558 EGR Vacuum Regulator (EVR) circuit failure KOEO
559 Air Conditioning On (ACON) relay circuit failure KOEO
563 High Fan Control (HFC) circuit failure KOEO
564 Fan Control (FC) circuit failure KOEO
565 Canister Purge (CANP) circuit failure KOEO
566 3-4 shift solenoid circuit failure KOEO (A4LD)
567 Speed Control Vent (SCVNT) circuit failure (KOEO IVSC test)
568 Speed Control Vacuum (SCVAC) circuit failure (KOEO IVSC test)
569 Auxiliary Canister Purge (CANP2) circuit failure KOEO
571 EGRA solenoid circuit failure KOEO
572 EGRV solenoid circuit failure KOEO
578 A/C pressure sensor circuit shorted
579 Insufficient A/C pressure change
581 Power to Fan circuit over current
582 Fan circuit open
583 Power to Fuel pump over current
584 VCRM Power ground circuit open (VCRM Pin 1)
585 Power to A/C clutch over current
586 A/C clutch circuit open
587 Variable Control Relay Module (VCRM) communication failure
617 1-2 shift error
618 2-3 shift error
619 3-4 shift error
621 Shift Solenoid 1 (SS1) circuit failure KOEO
622 Shift Solenoid 2 (SS2) circuit failure KOEO
623 Transmission Control Indicator Light (TCIL) circuit failure
624 Electronic Pressure Control (EPC) circuit failure
625 Electronic Pressure Control (EPC) driver open in PCM
626 Coast Clutch Solenoid (CCS) circuit failure KOEO
627 Torque Converter Clutch (TCC) solenoid circuit failure
628 Excessive converter clutch slippage
629 Torque Converter Clutch (TCC) solenoid circuit failure
631 Transmission Control Indicator Lamp (TCIL) circuit failure KOEO
632 Transmission Control Switch (TCS) circuit did not change states during KOER
633 4x4L switch closed during KOEO
634 Transmission Range (TR) voltage higher or lower than expected
636 Transmission Fluid Temp (TFT) higher or lower than expected
637 Transmission Fluid Temp (TFT) sensor circuit above maximum voltage/ -40°F (-40°C) indicated/circuit open
638 Transmission Fluid Temp (TFT) sensor circuit below minimum voltage/
290°F (143°C) indicated/circuit shorted
639 Insufficient input from Transmission Speed Sensor (TSS)
641 Shift Solenoid 3 (SS3) circuit failure
643 Torque Converter Clutch (TCC) circuit failure
645 Incorrect gear ratio obtained for first gear
646 Incorrect gear ratio obtained for second gear
647 Incorrect gear ratio obtained for third gear
648 Incorrect gear ratio obtained for fourth gear
649 Electronic Pressure Control (EPC) higher or lower than expected
651 Electronic Pressure Control (EPC) circuit failure
652 Torque Converter Clutch (TCC) solenoid circuit failure
653 Transmission Control Switch (TCS) did not change states during KOER
654 Transmission Range (TR) sensor not indicating PARK during KOEO
656 Torque Converter Clutch continuous slip error
657 Transmission over temperature condition occurred
659 High vehicle speed in park indicated
667 Transmission Range sensor circuit voltage below minimum voltage
668 Transmission Range circuit voltage above maximum voltage
675 Transmission Range sensor circuit voltage out of range
998 Hard fault present ****FMEM MODE****