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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0351: Ignition 1 Control Circuit Malfunction, DTC P0352: Ignition 2 Control Circuit Malfunction, DTC P0353: Ignition 3 Control Circuit Malfunction, DTC P0354: Ignition 4 Control Circuit Malfunction, DTC P0355: Ignition 5 Control Circuit Malfunction &/Or DTC P0356: Ignition 6 Control Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
  2. Turn ignition on. Using scan tool, read and record FAIL RECORDS data for DTCs P0351-P0356. Operate vehicle within FAILURE RECORDS conditions. On scan tool, monitor DTC information. If scan tool indicates DTC P0351-P0356 FAILED THIS IGNITION, go to next step. If scan tool display is not as specified, check for an intermittent problem. See DIAGNOSTIC AIDS .
  3. Check ignition coils for poor, loose or corroded connections or damaged terminals. If a problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to next step.
  4. Check PCM harness connectors E-21 and E-22 for poor, loose or corroded connections or damaged terminals. If a problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, reconnect any disconnected harness connectors and go to next step.
  5. Turn ignition on. Backprobing at ION Sensing Module (ISM) harness connector, use DVOM to measure voltage between ground and specified ISM circuits. See CHECKING ION SENSING MODULE CIRCUITS  table. See Figure. Voltage reading should be 25-55 millivolts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  9.
    CHECKING ION SENSING MODULE CIRCUITS

    Ignition Coil No. Harness Connector Terminal No. Wire Color
    1 E-16/10 Red
    2 E-16/2 Red/Black
    3 E-16/8 Red/Blue
    4 E-16/3 Red/White
    5 E-16/9 Red/Yellow
    6 E16/4 Red/Green
  6. Start engine. Backprobing at ISM harness connector, measure voltage between ground and specified ISM circuits. See CHECKING ION SENSING MODULE CIRCUITS  table. See Figure. If voltage toggles back and forth at least 20-50 millivolts within the range of 100-180 millivolts, go to next step. If voltage is not as specified, go to step  13.
  7. Turn ignition off. Disconnect suspect ignition coil 3-pin harness connector. While cranking engine, measure voltage at suspect ignition coil harness connector terminal No. 1. See Figure. See WIRING DIAGRAMS article. Voltage reading should be 200-1200 millivolts. If voltage reading is as specified, go to next step. If voltage reading is not as specified, go to step  11.
  8. Replace suspect ignition coil. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  9. Turn ignition off. Disconnect PCM 80-pin harness connectors E-21 (Blue) and E-22 (Red). PCM is located at right rear of engine compartment. Disconnect suspect ignition coil 3-pin harness connector. Check for a short to ground in ignition control circuit between PCM and ignition coil of suspect coil. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, leave harness connectors disconnected and go to next step.
  10. Check for a short to voltage in ignition control circuit between PCM and ignition coil of suspect coil. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to step  13.
  11. Check for a open in ignition control circuit between PCM and ignition coil of suspect coil. If problem is found, go to next step. If no problem is found, go to step  13.
  12. Repair open in ignition control circuit between PCM and ignition coil of suspect coil. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  13. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT  under POWERTRAIN CONTROL MODULE. Use scan tool to clear DTC and verify repair.
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