DTC P2101


DTC P2101	Drive-by-wire relay control circuit problem
DETECTION CONDITION	• The PCM monitors the input voltage from the drive-by-wire relay when the PCM turns the drive-by-wire relay on. If the input voltage is less than 5.0 V, the PCM determines that the drive-by-wire relay control circuit voltage is low. • The PCM monitors the input voltage from the drive-by-wire relay when the PCM turns the drive-by-wire relay off. If the input voltage is more than 5.0 V, the PCM determines that the drive-by-wire relay control circuit voltage is high. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. • PENDING CODE is available if the PCM detects the above malfunction condition. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Drive-by-wire relay malfunction • Connector or terminal malfunction • Open circuit in wiring harness between main relay terminal C and drive-by-wire relay terminal A • Short to GND in wiring harness between main relay terminal C and drive-by-wire relay terminal A • Open circuit in wiring harness between drive-by-wire relay terminal E and PCM terminal 5H • Short to GND in wiring harness between drive-by-wire relay terminal E and PCM terminal 5H • Open circuit in wiring harness between battery positive terminal and drive-by-wire relay terminal D • Short to GND in wiring harness between battery positive terminal and drive-by-wire relay terminal D • Open circuit in wiring harness between drive-by-wire relay terminal C and PCM terminal 4C • Short to power supply in wiring harness between drive-by-wire relay terminal C and PCM terminal 4C • Short to GND in wiring harness between drive-by-wire relay terminal C and PCM terminal 4C • PCM malfunction


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA 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	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT DRIVE-BY-WIRE RELAY CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the drive-by-wire relay connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 10.
3		No	Go to the next step.
4	INSPECT DRIVE-BY-WIRE RELAY POWER CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GND • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between the following circuits: – Drive-by-wire relay terminal A (wiring harness-side) and body GND – Drive-by-wire relay terminal D (wiring harness-side) and body GND • Is the voltage B+?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness for a possible open circuit or short to GND, then go to Step 10.
5	INSPECT DRIVE-BY-WIRE RELAY CIRCUIT FOR SHORT TO GND • Turn the ignition switch off. • Inspect for continuity between the following circuits: – Drive-by-wire relay terminal E (wiring harness-side) and body GND – Drive-by-wire relay terminal C (wiring harness-side) and body GND • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to GND, then go to Step 10.
5		No	Go to the next step.
6	INSPECT DRIVE-BY-WIRE RELAY CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between drive-by-wire relay terminal C (wiring harness-side) and body GND. • Is the voltage B+?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 10.
6		No	Go to the next step.
7	INSPECT DRIVE-BY-WIRE RELAY • Inspect the drive-by-wire relay. (See RELAY INSPECTION.) • Is there any malfunction?	Yes	Replace the drive-by-wire relay, then go to Step 10. (See RELAY LOCATION.)
7		No	Go to the next step.
8	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 the terminal, then go to Step 10.
8		No	Go to the next step.
9	INSPECT DRIVE-BY-WIRE RELAY CONTROL CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between the following circuits: – Drive-by-wire relay terminal E (wiring harness-side) and PCM terminal 5H (wiring harness-side) – Drive-by-wire relay terminal C (wiring harness-side) and PCM terminal 4C (wiring harness-side) • Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P2101 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE.)
11		No	DTC troubleshooting completed.