DTC P2681:00 [SKYACTIV-D 1.5]

id0102q2432100

DTC P2681:00

Circuit malfunction in coolant control valve control system

DETECTION CONDITION

•  The coolant control valve drive current exceeds the specification or drive circuit temperature is 175 °C {347 °F} or more for a continuous 3 s when the following condition is met:

MONITORING CONDITIONS

―  PCM internal processor malfunction DTC P0606:00 not detected.

Diagnostic support note

•  This is a continuous monitor (CCM).

•  The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

•  FREEZE FRAME DATA/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  PCM restricts engine torque.

•  Inhibits the EGR control.

•  Inhibits the auto diesel particulate filter regeneration control.

•  Inhibits the compulsory diesel particulate filter regeneration control.

•  Inhibits engine-stop by operating the i-stop function.

POSSIBLE CAUSE

•  Coolant control valve connector or terminals malfunction

•  Short to ground in wiring harness between the following terminals:

―  Coolant control valve terminal B—PCM terminal 1BM

―  Coolant control valve terminal C—PCM terminal 1BR

•  PCM connector or terminals malfunction

•  Short to power supply in wiring harness between the following terminals:

―  Coolant control valve terminal B—PCM terminal 1BM

―  Coolant control valve terminal C—PCM terminal 1BR

•  Coolant control valve malfunction

•  PCM malfunction

DTC P2681:00	Circuit malfunction in coolant control valve control system
DETECTION CONDITION	• The coolant control valve drive current exceeds the specification or drive circuit temperature is 175 °C {347 °F} or more for a continuous 3 s when the following condition is met: MONITORING CONDITIONS ― PCM internal processor malfunction DTC P0606:00 not detected. Diagnostic support note • This is a continuous monitor (CCM). • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• PCM restricts engine torque. • Inhibits the EGR control. • Inhibits the auto diesel particulate filter regeneration control. • Inhibits the compulsory diesel particulate filter regeneration control. • Inhibits engine-stop by operating the i-stop function.
POSSIBLE CAUSE	• Coolant control valve connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― Coolant control valve terminal B—PCM terminal 1BM ― Coolant control valve terminal C—PCM terminal 1BR • PCM connector or terminals malfunction • Short to power supply in wiring harness between the following terminals: ― Coolant control valve terminal B—PCM terminal 1BM ― Coolant control valve terminal C—PCM terminal 1BR • Coolant control valve malfunction • PCM malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the FREEZE FRAME DATA/snapshot data on the repair order.	—	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 COOLANT CONTROL VALVE CONNECTOR CONDITION • Switch the ignition off. • Disconnect the coolant control valve connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 8.
3		No	Go to the next step.
4	INSPECT COOLANT CONTROL VALVE CIRCUIT FOR SHORT TO GROUND • Verify that the coolant control valve connector is disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Coolant control valve terminal B ― Coolant control valve terminal C • Is there continuity?	Yes	Disconnect the PCM connector and inspect the wiring harness for short to ground. • If the short to ground circuit could be detected in the wiring harness: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Coolant control valve terminal B—PCM terminal 1BM • Coolant control valve terminal C—PCM terminal 1BR If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • If the short to ground circuit could not be detected in the wiring harness: ― Replace the PCM (short to ground in the PCM internal circuit). (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) Go to Step 8.
4		No	Go to the next step.
5	INSPECT PCM CONNECTOR CONDITION • 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 and/or terminals, then go to Step 8.
5		No	Go to the next step.
6	INSPECT COOLANT CONTROL VALVE CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the coolant control valve and PCM connectors are disconnected. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the following terminals (wiring harness-side): ― Coolant control valve terminal B ― Coolant control valve terminal C • Is the voltage 0 V?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Coolant control valve terminal B—PCM terminal 1BM • Coolant control valve terminal C—PCM terminal 1BR If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
7	INSPECT COOLANT CONTROL VALVE • Inspect the coolant control valve. (See COOLANT CONTROL VALVE INSPECTION [SKYACTIV-D 1.5].) • Is there any malfunction?	Yes	Replace the coolant control valve, then go to the next step. (See COOLANT CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
7		No	Go to the next step.
8	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-D 1.5].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [SKYACTIV-D 1.5].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) Go to the next step.
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 1.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-D 1.5].)
9		No	DTC troubleshooting completed.