DTC P0102 [L3]


DTC P0102	MAF circuit low input
DETECTION CONDITION	• The PCM monitors input voltage from the MAF sensor when engine is running. If input voltage at PCM terminal 1P is below 0.21 V, the PCM determines that the MAF circuit has malfunction. Diagnostic support note • This is a continuous monitor (CCM). • MIL illuminates if PCM detects the above malfunction condition during first drive cycle. • PENDING CODE is available if PCM detects the above malfunction condition. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• MAF sensor malfunction • Connector or terminal malfunction • Short to ground in wiring between MAF/IAT sensor terminal C and PCM terminal 1P • Open circuit in wiring between MAF/IAT sensor terminal C and PCM terminal 1P • Open circuit in wiring between main relay and MAF/IAT sensor terminal A


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE [L3].) • Is the same DTC present?	Yes	Go to the next step.
1		No	Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].)
2	INSPECT POOR CONNECTION OF MAF SENSOR CONNECTOR • Turn the ignition switch off. • Disconnect the MAF/IAT sensor connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair or replace the terminals, then go to Step 7.
2		No	Go to the next step.
3	CHECK POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the ON position (Engine off). • Inspect the voltage at MAF/IAT sensor terminal A (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
3		No	Inspect for open circuit in the wiring harness between MAF/IAT sensor terminal A (wiring harness-side) and main relay. Repair or replace the wiring harness, then go to Step 7.
4	INSPECT POOR CONNECTION OF PCM CONNECTOR • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair the terminal, then go to Step 7.
4		No	Go to the next step.
5	INSPECT MAF SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT • Remove the PCM with the PCM connector connected. • Inspect for continuity between MAF/IAT sensor terminal C (wiring harness-side) and PCM terminal 1P (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness, then go to Step 7.
6	INSPECT MAF SENSOR SIGNAL CIRCUIT FOR SHORTS • Inspect for continuity between the following circuits: - MAF/IAT sensor terminal C (wiring harness-side) and body ground - MAF/IAT sensor connector terminal C (wiring harness-side) and B (wiring harness-side) • Is there continuity?	Yes	Repair or replace the wiring harness, then go to the next step.
6		No	Replace the MAF/IAT sensor, then go to the next step.
7	VERIFY TROUBLESHOOTING OF DTC P0102 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform KOEO/KOER self-test. (See KOEO/KOER SELF-TEST PROCEDURE [L3].) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3].)
7		No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L3].)
8		No	Troubleshooting completed.