DTC P0102 [L8, LF]

id0102b1803200

DTC P0102

MAF sensor circuit low input

DETECTION CONDITION

•  The PCM monitors input voltage from the MAF sensor when the engine running. If the input voltage is below 0.21 V, the PCM determines that the MAF circuit has a malfunction.

Diagnostic support note

•  This is a continuous monitor (CCM).

•  The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.

•  FREEZE FRAME DATA (Mode 2/Mode 12) is available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  MAF/IAT sensor connector or terminals malfunction

•  Open circuit or short to ground in wiring harness between main relay and MAF/IAT sensor terminal A

―  Short to ground in wiring harness between main relay and MAF/IAT sensor terminal A

―  EGI COMP2 10 A fuse malfunction

―  Open circuit in wiring harness between main relay and MAF/IAT sensor terminal A

•  Short to ground in wiring harness between MAF/IAT sensor terminal C and PCM terminal 1AK

•  PCM connector or terminals malfunction

•  Open circuit in wiring harness between MAF/IAT sensor terminal C and PCM terminal 1AK

•  MAF sensor signal circuit and ground circuit are shorted to each other

•  MAF sensor malfunction

•  PCM malfunction

DTC P0102	MAF sensor circuit low input
DETECTION CONDITION	• The PCM monitors input voltage from the MAF sensor when the engine running. If the input voltage is below 0.21 V, the PCM determines that the MAF circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• MAF/IAT sensor connector or terminals malfunction • Open circuit or short to ground in wiring harness between main relay and MAF/IAT sensor terminal A ― Short to ground in wiring harness between main relay and MAF/IAT sensor terminal A ― EGI COMP2 10 A fuse malfunction ― Open circuit in wiring harness between main relay and MAF/IAT sensor terminal A • Short to ground in wiring harness between MAF/IAT sensor terminal C and PCM terminal 1AK • PCM connector or terminals malfunction • Open circuit in wiring harness between MAF/IAT sensor terminal C and PCM terminal 1AK • MAF sensor signal circuit and ground circuit are shorted to each other • MAF sensor malfunction • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED • Has the FREEZE FRAME DATA (Mode 12) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 12) on the repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT MAF/IAT SENSOR CONNECTOR AND TERMINALS • Turn the ignition switch off. • Disconnect the MAF/IAT sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 10.
3		No	Go to the next step.
4	INSPECT MAF SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • MAF/IAT sensor connector is disconnected. • Turn the ignition switch to the ON position. (engine off) • Measure the voltage between MAF/IAT sensor terminal A (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Go to the next step.
4		No	Inspect the EGI COMP2 10 A fuse. If the fuse is melt: • Repair or replace the wiring harness for a possible short to ground, then replace the fuse. If the fuse is deterioration: • Replace the fuse. If the fuse is normal: • Repair or replace the wiring harness for a possible open circuit. Go to Step 10.
5	INSPECT MAF SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND • MAF/IAT sensor connector is disconnected. • Turn the ignition switch off. • Inspect for continuity between MAF/IAT sensor terminal C (wiring harness-side) and body ground. • Is there continuity?	Yes	If the short to ground circuit could be detected: • Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: • Replace the PCM (short to ground in PCM internal circuit). (See PCM REMOVAL/INSTALLATION [L8, LF].) Go to Step 10.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR AND TERMINALS • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 10.
6		No	Go to the next step.
7	INSPECT MAF SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT • MAF/IAT sensor and PCM connectors are disconnected. • Inspect for continuity between MAF/IAT sensor terminal C (wiring harness-side) and PCM terminal 1AK (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 10.
8	INSPECT MAF SENSOR SIGNAL AND GROUND CIRCUITS FOR SHORT TO EACH OTHER • MAF/IAT sensor and PCM connectors are disconnected. • Inspect for continuity between MAF/IAT sensor terminal C and B (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
8		No	Repair or replace the wiring harness for a possible short to each other, then go to Step 10.
9	INSPECT MAF SENSOR • Reconnect the MAF/IAT sensor connector. • Inspect the MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [L8, LF].) • Is there any malfunction?	Yes	Replace the MAF/IAT sensor, then go to the next step. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [L8, LF].)
9		No	Go to the next step.
10	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [L8, LF].) • Start the engine and warm it up completely. • Perform the KOEO/KOER self test. (See KOEO/KOER SELF TEST [L8, LF].) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
11		No	DTC troubleshooting completed.