EEC-IV Fault Codes

 

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Fault Code Diagnostics for EEC IV (obd-1)

Here I hope is the definitive list of Fault codes for the EEC IV. I've compiled this from several sources

Folks with cars later than mid 95 have the EEC V unit and should visit http://www.obd-2.com./

Command Codes for EEC IV

CODE MEANING ACTION
010 Separator/Command Code Momentarily depress accelerator pedal fully
020 Command Code Momentarily depress brake pedal fully
030 Command Code Momentarily depress brake pedal fully

Fault Codes for EEC IV

CODE MEANING ACTION
1 - 8 Cylinder No (as code) low power Cylinder balance test
9 Pass Cylinder balance test
10 Cylinder No. 1 low Cylinder balance test
11 Cylinder No. 2 low Cylinder balance test
12 Cylinder No. 3 low Cylinder balance test
12 Cylinder No. 4 low Cylinder balance test
111 All systems OK
112 Low voltage air change temperature sensor (ACT) Normal operating temp not reached
113 High voltage air change temperature sensor (ACT) Normal operating temp not reached
114 Out of range voltage air change temperature sensor (ACT) Normal operating temp not reached
116 Out of range Engine coolant temperature sensor (ECT) Normal operating temp not reached
117 Low voltage Engine coolant temperature sensor (ECT) Normal operating temp not reached
118 High voltage Engine coolant temperature sensor (ECT) Normal operating temp not reached
121 Outside range throttle position sensor (TPS)
122 Low voltage throttle position sensor (TPS)
123 High voltage throttle position sensor (TPS)
124 Above spec throttle position sensor (TPS)
125 Below spec throttle position sensor (TPS)
126 MAP voltage above spec
128 MAP sensor/vacuum hose fault
129 MAF sensor, no MAF change during throttle depression Repeat self test proceedure
136 Lambda sensor (left) mixture lean
137 Lambda sensor (left) mixture rich
139 Lambda sensor (left)
144 Lambda sensor (right)
157 Low voltage mass air flow sensor (MAF)
158 HIGH voltage mass air flow sensor (MAF)
159 Outside range mass air flow sensor (MAF)
167 Throttle position sensor (TPS). No change during throttle depression Repeat self test procedure
171 Lambda sensor (right)
172 Lambda sensor (right) too lean
173 Lambda sensor (right) too rich
174 Lambda sensor (right) slow response
175 Lambda sensor (left)
176 Lambda sensor (left) too lean
177 Lambda sensor (left) too rich
178 Lambda sensor (left) slow response
179 Fuel system lean, part throttle
181 Fuel system rich, part throttle
182 Idle mixture too lean Idle speed control vale (ISC)
183 Idle mixture too rich Idle speed control vale (ISC)
184 Above spec manifold air flow sensor
185 Below spec manifold air flow sensor
186 Too long injection time pulse width
187 Too short injection time pulse width
188 Lambda sensor on left, mixture too lean (part throttle)
189 Lambda sensor on left, mixture too rich (part throttle)
191 Idle mixture too lean, left hand Lambda sensor Check EGR valve, check ISC valve
192 Idle mixture too rich, lright hand Lambda sensor Check EGR valve, check ISC valve
193 Flexible fuel sensor circuit
194 Lambda sensor
195 Lambda sensor
211 PIP signal
212 Tach, circuit, SPOUT grounded. SPOUT circuit, open circuit
213 Tach, circuit, SPOUT grounded. SPOUT circuit, open circuit
214 CID circuit failure
215 #1 Coil
216 #2 Coil
217 #3 Coil
218 Tachometer circuit
219 Spark timing default to 10 deg rectify SPOUT circuit
220 Tachometer circuit
221 Spark timing error
225 Knock sensor
226 EEC IV/EDIS module pulse
227 Engine speed/crankshaft position sensor (CPS)
228 EDIS module/ignition coil winding 1
229 EDIS module/ignition coil winding 2
231 EDIS module/ignition coil winding 3
232 Primary circuit of ignition coil (IGC)
233 EDIS module
234 Ignition Coil (IGC)
235 Ignition Coil (IGC)
236 Ignition Coil (IGC)
237 Ignition Coil (IGC)
238 EDIS module/ignition coil
239 PIP signal present when cranking
241 EEC IV/EDIS module, incorrect self test data Repeat self test procedure
243 Coil failure
244 Cylinder identification fault when power balance requested
311- 316 Pulse air/thermactar air system faulty
326 Electronic pressure transducer (EPT)/differential pressure feedback exhaust (DPFE) sensor
327 Electronic pressure transducer (EPT)/differential pressure feedback exhaust (DPFE) sensor/electronic vacuum regulator (EVR)
328 Electronic vacuum regulator (EVR)
332 EGR valve not opening
334 Electronic vacuum regulator
335 Electronic pressure transducer (EPT)/differential pressure feedback exhaust (DPFE) sensor
336 Exhaust pressure too high
337 Electronic pressure transducer (EPT)/differential pressure feedback exhaust (DPFE) sensor/electronic vacuum regulator (EVR)
338 Cooling System
339 Cooling System
341 Octane adjust (service multiplug) grounded Disconnect for self test, reconnect after
411 Engine speed during self test too low Cure induction leaks, repeat test
412 Engine speed during self test too low Cure induction leaks, repeat test
413 - 416 ISC valve Cure induction leaks, repeat test
452 Vehicle speed sensor
453 Servo leaking down
454 Servo leaking up
455 Insufficient RPM increase
456 Insufficient RPM decrease
457 - 458 Speed control fault
511 ROM fault Battery disconnected, check KAM fuse. if OK module faulty
512 Keep alive memory (KAM) fault Battery disconnected, check KAM fuse. if OK module faulty
513 EEC IV module reference voltage V
519 Power steering pressure switch (PSPS) not activated during self test Repeat test
521 Power steering pressure switch (PSPS) not activated during self test Repeat test
522 Neutral/drive switch (NDS)
525 Vehicle in gear or air conditioning on
528 Clutch switch error
536 Brake on/off (BOO) switch not activated during self test Repeat test
538 Operating error during self test. Air Conditioning switched on Repeat test
539 Operating error during self test. Air Conditioning switched on Repeat test
542 Fuel pump (FP) circuit failure
543 Fuel pump (FP) circuit failure
551 Idle speed control (ISC) circuit failure
552 Pulse air circuit failure
554 Fuel pressure regulator control circuit failure
556 Electrical circuit of fuel pump
557 Low speed fuel pump circuit
558 Electrical circuit of (EVR) electronic vacuum regulator
563 High speed electric drive fan relay/circuit (HEDF) failure
564 Electronic drive fan relay/circuit (EDF) failure
565 Canister purge solenoid (CANP)
566 3rd/4th gear solenoid (ATA)
573 Electronic drive fan relay/circuit (EDF) failure
574 High speed electronic drive fan relay/circuit (HEDF) failure
575 Fuel pump circuit and/or inertia switch circuit
576 Kick down switch (KDS) Repeat test
577 Kick down switch (KDS) not activated during self test Repeat test
583 Power to fuel pump fault
612 4/3 switch failed open circuit
613 4/3 switch failed open circuit
614 3/2 switch short circuit
615 3/2 switch failed short circuit
621 Shift solenoid 1 circuit failed
622 Shift solenoid 2 circuit failed
624 EPC solenoid failure
625 EPC solenoid circuit failure
628 MLUS Failure
629 Torque converter lock up clutch solenoid (LUS)
634 Neutral drive switch (NDS) circuit failure
635 Transmission temperature switch failure
637 Transmission temperature switch failure
639 TSS failure
645 1st gear failure
646 2nd gear failure
647 3rd gear failure
648 4th gear failure
649 ETV failure
651 ETV intermittent failure
652 MLUS circuit failure
653 Transmission control switch not activated during self test Repeat test
998 Fault in ECT/ACT/MAF/TPR circuit

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