DTC P2123:00 [MZI-3.7]

id0102d2708400

DTC P2123:00 | APP sensor No.1 circuit high input
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DETECTION CONDITION | • APP sensor No.1 is out of self-test range high.
POSSIBLE CAUSE | • Connector or terminal malfunction • APP sensor malfunction • Open circuit wiring harness between APP sensor terminal F and PCM terminal 1X • Open circuit wiring harness between APP sensor terminal A and PCM terminal 1Z • Open circuit wiring harness between APP sensor terminal D and PCM terminal 1AB • Open circuit wiring harness between APP sensor terminal C and PCM terminal 1AD • Open circuit wiring harness between APP sensor terminal E and PCM terminal 1Y • Short to power supply in wiring harness between APP sensor terminal F and PCM terminal 1X • Short to power supply in wiring harness between APP sensor terminal A and PCM terminal 1Z • Short to power supply in wiring harness between APP sensor terminal D and PCM terminal 1AB • Short to power supply in wiring harness between APP sensor terminal C and PCM terminal 1AD • Short to power supply in wiring harness between APP sensor terminal E and PCM terminal 1Y

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record FREEZE FRAME DATA 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.
No | Go to the next step.
3 | INSPECT APP SENSOR CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the APP sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are there any malfunction? | Yes | Repair or replace suspected part, then go to Step 8.
No | Go to the next step.
4 | INSPECT APP SENSOR NO.1 • Inspect APP sensor No.1. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [MZI-3.7].) • Is there any malfunction? | Yes | Replace the accelerator pedal, then go to Step 8. (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [MZI-3.7].)
No | Go to the next step.
5 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace suspected part, then go to Step 8.
No | Go to the next step.
6 | INSPECT APP SENSOR NO.1 CIRCUIT FOR OPEN CIRCUIT • APP sensor and PCM connectors are disconnected. • Turn the ignition switch off. • Inspect for continuity between the following terminals (wiring harness-side). ― APP sensor terminal F and PCM terminal 1X. ― APP sensor terminal A and PCM terminal 1Z. ― APP sensor terminal D and PCM terminal 1AB. ― APP sensor terminal C and PCM terminal 1AD. ― APP sensor terminal E and PCM terminal 1Y. • Are there continuity? | Yes | Go to the next step.
No | Repair or replace suspected part, then go to Step 8.
7 | INSPECT APP SENSOR NO.1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • APP sensor and PCM connectors are disconnected. • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between the following terminals (wiring harness-side). ― APP sensor terminal F and body ground. ― APP sensor terminal A and body ground. ― APP sensor terminal D and body ground. ― APP sensor terminal C and body ground. ― APP sensor terminal E and body ground. • Are there voltage B+? | Yes | Repair or replace suspected part, then go to Step 8.
No | Go to the next step.
8 | VERIFY TROUBLESHOOTING OF DTC P2123:00 HAS BEEN COMPLETED • Verify that all disconnected connectors reconnected. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • Is the same DTC present? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Troubleshooting completed.