Check Ecm Power Source Circuit

CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

Disconnect the C15 A/F sensor connector.

Disconnect the C24 ECM connector.

Measure the resistance between the terminals of the wire harness side connectors.

Standard resistance (Check for open)

Tester Connection

Specified Condition

Below 1 Q

Standard resistance (Check for short)

Tester Connection

Specified Condition

1G kQ or higher

(d) Reconnect the A/F sensor connector.

(e) Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK WHETHER DTC OUTPUT RECURS

Result

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position.

(e) Start the engine.

(f) Allow the engine to idle for 1 minute or more.

(g) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES

Display (DTC Output)

No output

PGG31 or PGG32

Proceed to

REPLACE ECM

CHECK FOR INTERMITTENT PROBLEMS

DTC

PGG37

Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

DTC

PGG3B

Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)

DTC

PG141

Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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