Bad PCM

BAD PCM TROUBLESHOOT

How can I be sure if my PCM is bad???
Couple weeks ago check engine light came on. Already had issues with ABS light and Traction Control light being on and removed ABS fuses to prevent false engagement of ABS system (I have seen this to be a common problem reported on ABS system). The plan was to replace the front hub assemblies with new ones that had new bearings and ABS sensors. After changing the first hub assembly, disconnected battery negative cable and reconnected after 30 minutes, started the vehicle and noticed no more Check Engine Light but ABS light still on. Decided to replace ABS fuses and disconnect battery NEG cable again for 30 minutes and try again. This time the vehicle would not start at all!! It would crank over fine, but no start. Seemed to have plenty of fuel pressure so checked spark, no spark!! Checked spark on 2 cylinders that use opposite coils in the coil back and neither has spark. Checked RPM while cranking with scanner to verify Crank Position Sensor and scanner showed approx 150 RPM while cranking. Scanned the computer for DTCs and scanner reported 30 DTCs, including open circuits on all 6 cylinder injectors, Got the following codes: Is this a strong indication of PCM failure??? P0030 ENG The ENG codes are reported as CONFIRMED P0036 ENG P0201 ENG P0202 ENG P0203 ENG P0204 ENG P0205 ENG P0206 ENG P0443 ENG P0449 ENG P0481 ENG P0030 MOD $00 The MOD $00 codes are reported as PENDING P0036 MOD $00 P0201 MOD $00 P0202 MOD $00 P0203 MOD $00 P0204 MOD $00 P0205 MOD $00 P0206 MOD $00 P0443 MOD $00 P0449 MOD $00 P0481 MOD $00.

I would try disconnecting battery again. Disconnect both cables and touch them together for a few seconds. This will reset all modules. Wierd that you had so many codes after just disconnecting battery. Sometimes very hard to tell if ecm is bad.

Pcm repair

DTC P1166: A/F Sensor (Sensor 1) Heater Circuit Malfunction Reset the ECM/PCM. Start the engine.Is DTC P1166 indicated? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C101 (located under the right side of the dash), C401 (located under the left side of the dash), C402 (located under under the left side of the dash) the A/F Sensor relay, the A/F Sensor (Sensor 1) and the ECM/PCM. Check the following fuse: No.14 OPTION (30A) fuse in under-hood fuse/relay box. No.2+B LAF HEATER (20A) fuse in under-dash fuse/relay box. No. 4ACG (10A) in under-dash fuse/relay box.Are any of the fuses blown? YES - Repair short in the wire between the A/F Sensor relay and the fuses. NO - Go to step 4. Measure voltage between ECM/PCM connector terminals A1 and A24, 30 seconds after the ignition switch is turned ON (II).Is there battery voltage? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. NO - Go to step 5. Measure voltage between ECM/PCM connector terminals A22 and A24.Is there battery voltage? YES - Go to step 6. NO - Go to step 10. Turn the ignition switch OFF. Disconnect ECM/PCM connector E (31P). Turn the ignition switch ON (II). Connect ECM/PCM connector terminal E8 to body ground with a jumper wire, then measure voltage between ECM/PCM connector terminals A1 and A24.Is there battery voltage? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. NO - Repair open or short in the wire between the A/F Sensor (Sensor 1) and ECM/PCM (A1). Turn the ignition switch OFF. Disconnect the ECM/PCM connector A (31P) and the A/F Sensor (Sensor 1) 4P connector. Check for continuity between the A/F Sensor (Sensor 1) 4P connector terminal No.3 and body ground.Is there continuity? YES - Repair short in the wire between the A/F Sensor relay, A/F Sensor (Sensor 1) and ECM/PCM (A22). NO - Go to step 13. Turn the ignition switch ON (II). Measure voltage between ECM/PCM connector terminals E8 and A24.Is there battery voltage? YES - Repair open in the wire between the ECM/PCM (A22) and the A/F Sensor (Sensor 1). NO - Go to step 15. Check for continuity in the wires between the A/F Sensor and the fuses.Is there continuity? YES - The wires are OK. Replace the A/F Sensor relay. NO Repair open in the wire between the A/F Sensor relay and the fuses.


Code p1166 refers to heated oxygen sensor(HO2S)-front heater circuit===causes --wiring-- HO2S sensor--ECM

Citreon picasso 1.6 hdi engine code errors P1166 & P0193

1.6hdi engine warning comes on showing engine fault engine then cuts out at low speed or when stopping;fault codes P1166 & P0193.problem clears when car is left for a few hours only to return at no given time or distance traveled.

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