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DTC P0604: INTERNAL CONTROL MODULE MEMORY CHECK SUM ERROR Subaru Outback BH

Testing & Diagnostics 1 illustration ~359 words

Perform basic diagnostic procedure. See BASIC DIAGNOSTIC PROCEDURE . If DTC P0604 exists, replace ECM. Clear memory and perform verification procedure. See CLEARING DIAGNOSTIC TROUBLE CODES and VERIFICATION PROCEDURE .

Scheme 75

Scheme 75: DTC P0661: INDUCTION VALVE CONTROL SOLENOID CIRCUIT LOW INPUT
Scheme 75: DTC P0661: INDUCTION VALVE CONTROL SOLENOID CIRCUIT LOW INPUT
  1. Perform basic diagnostic procedure. See «BASIC DIAGNOSTIC PROCEDURE»(ref-63535-S26517940312001020900000). Turn ignition on. Using a DVOM connected to ground, backprobe ECM connector B137 (31-pin connector) terminal No. 23. see scheme 4 If voltage is more than 10 volts, circuit has returned to normal, contact authorized Subaru dealership because probable cause is deterioration of multiple parts. If voltage is not more than 10 volts, go to next step.
  2. Turn ignition off. Disconnect induction control solenoid valve connector and ECM connector B137 (31-pin connector). Measure resistance between induction control solenoid valve connector terminal No. 2 and ground. (Scheme 75) If resistance is less than 10 ohms, locate and repair short to ground in wiring between ECM and induction control solenoid valve. If resistance is not less than 10 ohms, go to next step.
  3. Measure resistance between induction control solenoid valve connector terminal No. 2 and ECM connector B137 (31-pin connector) terminal No. 23. If resistance is less than one ohm, go to next step. If resistance is not less than 10 ohms, locate and repair open circuit in wiring and check for poor terminal contact in connectors between ECM and induction control solenoid valve.
  4. Remove induction control solenoid valve. Measure resistance between terminals of induction control solenoid valve. If resistance is 37-44 ohms, go to next step. If resistance is not 37-44 ohms, replace induction control solenoid valve.
  5. Turn ignition on. Measure voltage between induction control solenoid valve connector terminal No. 1 and engine ground. If voltage is more than 10 volts, go to next step. If voltage is not more than 10 volts, locate and repair open circuit in wiring between induction control solenoid valve and main relay.
  6. Check for poor terminal contact in induction control solenoid valve connector. Repair as necessary. If connector is okay, contact authorized Subaru dealership because probable cause is deterioration of multiple parts. Clear memory and perform verification procedure. «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-63535-S26931138132001020900000) and «VERIFICATION PROCEDURE»(ref-63535-S38101445392001020900000).

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