DTC P1259 [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)]

id0102b0836500

DTC P1259

IMMOBILIZER to PCM signal error

DETECTION CONDITION

•  The PCM does not complete target ID transfer.

POSSIBLE CAUSE

•  Immobilizer system malfunction

•  Communication error between immobilizer unit and PCM

•  PCM malfunction

DTC P1259	IMMOBILIZER to PCM signal error
DETECTION CONDITION	• The PCM does not complete target ID transfer.
POSSIBLE CAUSE	• Immobilizer system malfunction • Communication error between immobilizer unit and PCM • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available?	Yes	Go to appropriate DTC troubleshooting procedure. (See DTC TABLE [IMMOBILIZER SYSTEM].)
2		No	Go to the next step.
3	INSPECT IMMOBILIZER UNIT CONNECTOR FOR POOR CONNECTION • Turn engine switch off. • Disconnect the IMMOBILIZER UNIT connector. • Inspect for poor connection (such as damaged/ pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the suspected terminal, then go to Step 8.
3		No	Go to the next step.
4	INSPECT COMMUNICATION LINE FOR SHORT TO GROUND • Inspect for continuity between the following terminals and body ground: ― IMOBILIZER unit connector terminal A (wiring harness-side) • Is there continuity?	Yes	Repair or replace the suspected wiring harness, then go to Step 8.
4		No	Go to the next step.
5	INSPECT COMMUNICATION LINE FOR SHORT TO POWER SUPPLY • Measure the voltage between following terminals and body ground: ― IMMOBILIZER unit connector terminal A (wiring harness-side) • Is the voltage B+?	Yes	Repair or replace the suspected wiring harness, then go to Step 8.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn engine switch off. • Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [WL-C, WE-C].) • Inspect for poor connection (such as damaged/ pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the suspected terminal, then go to Step 8.
6		No	Go to the next step.
7	INSPECT COMMUNICATION LINE FOR OPEN CIRCUIT • Inspect for continuity between the following terminals: ― IMMOBILIZER UNIT connector terminal A (wiring harness-side) and PCM connector terminal 230 (wiring harness-side) • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the suspected wiring harness, then go to the next step.
8	VERIFY THAT DTC P1259 TROUBLESHOOTING IS COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine and warm-up to normal operating temperature. • Retrieve the DTC using the M-MDS. • Is the PENDING CODE same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [WL-C, WE-C].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure“. (See AFTER REPAIR PROCEDURE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].)
9		No	Troubleshooting completed.