DTC P181F:00 [TCM (GW6A-EL, GW6AX-EL)]

id0502o9960600

DTC P181F:00	Electric AT oil pump/Electric AT oil pump relay circuit malfunction
DETECTION CONDITION	• If the TCM detects any of the following conditions for a continuous 5 s: ? Electric AT oil pump circuit has a malfunction. ? Electric AT oil pump relay circuit has a malfunction.
FAIL-SAFE FUNCTION	• Inhibits i-stop control.
POSSIBLE CAUSE	• Electric AT oil pump relay malfunction • Electric AT oil pump malfunction • Electric AT oil pump connector or terminals malfunction • TCM malfunction • TCM connector or terminals malfunction • ENGINE3 15 A fuse malfunction • AT PUMP 15 A fuse malfunction • Short to ground in wiring harness between the following terminals: ? Electric AT oil pump relay terminal D—MAIN 200 A fuse ? Electric AT oil pump relay terminal C—Electric AT oil pump terminal D ? Electric AT oil pump relay terminal E—TCM terminal K ? Electric AT oil pump terminal C—TCM terminal L • Open circuit in wiring harness between the following terminals: ? Electric AT oil pump relay terminal D—MAIN 200 A fuse ? Electric AT oil pump relay terminal C—Electric AT oil pump terminal D ? Electric AT oil pump relay terminal E—TCM terminal K ? Electric AT oil pump terminal A—Body ground ? Electric AT oil pump terminal C—TCM terminal L • Short to power supply in wiring harness between the following terminals: ? Electric AT oil pump relay terminal E—TCM terminal K ? Electric AT oil pump terminal C—TCM terminal L

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	INSPECT ENGINE3 15 A FUSE • Switch the ignition OFF (LOCK). • Is the fuse normal?	Yes	Go to Step 3.
1		No	Repair the engine system for a malfunction first, then go to the next step.
2	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Replace the fuse if it is blown. • Clear DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (GW6A-EL, GW6AX-EL)].) • Perform the following procedure: 1. Operate i-stop for 10 s or more. • Perform the DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (GW6A-EL, GW6AX-EL)].) • Is the DTC P181F:00 displayed?	Yes	Go to the next step.
2		No	DTC troubleshooting completed.
3	INSPECT AT PUMP 15 A FUSE • Switch the ignition OFF (LOCK). • Is the fuse normal?	Yes	Go to the next step.
3		No	Go to Step 7.
4	INSPECT ELECTRIC AT OIL PUMP RELAY • Remove the electric AT oil pump relay. (See RELAY LOCATION.) • Inspect the electric AT oil pump relay. (See RELAY INSPECTION.) • Is there any malfunctioning location?	Yes	Replace the electric AT oil pump relay, then go to Step 12. (See RELAY LOCATION.)
4		No	Go to the next step.
5	INSPECT ELECTRIC AT OIL PUMP RELAY SUPPLY VOLTAGE • Measure the voltage at the electric AT oil pump relay terminal D (vehicle wiring harness side). • Is the voltage 0 V?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between MAIN 200 A fuse and electric AT oil pump relay terminal D. 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 an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 12.
5		No	Go to the next step.
6	INSPECT EACH CONNECTOR CONDITION • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the following connectors. ? TCM ? Electric AT oil pump • Visually inspect the engagement and connection condition of the connector, and terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunctioning location?	Yes	Repair or replace the connector/terminal, then go to Step 12.
6		No	Go to the next step.
7	INSPECT ELECTRIC AT OIL PUMP RELAY CIRCUIT AND ELECTRIC AT OIL PUMP CIRCUIT FOR SHORT TO GROUND • Verify that the electric AT oil pump relay, electric AT oil pump, and TCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ? Electric AT oil pump relay terminal C ? Electric AT oil pump relay terminal E ? AT oil pump terminal C • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Electric AT oil pump relay terminal C—Electric AT oil pump terminal D • Electric AT oil pump relay terminal E—TCM terminal K • Electric AT oil pump terminal C—TCM terminal L 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. Go to Step 12.
7		No	Go to the next step.
8	INSPECT ELECTRIC AT OIL PUMP RELAY CIRCUIT AND ELECTRIC AT OIL PUMP CIRCUIT FOR OPEN CIRCUIT • Verify that the electric AT oil pump relay, electric AT oil pump, and TCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ? Electric AT oil pump relay terminal C—Electric AT oil pump terminal D ? Electric AT oil pump relay terminal E—TCM terminal K ? Electric AT oil pump terminal C—TCM terminal L • Is there continuity?	Yes	Go to the next step.
8		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Electric AT oil pump relay terminal C—Electric AT oil pump terminal D • Electric AT oil pump relay terminal E—TCM terminal K • Electric AT oil pump terminal C—TCM terminal L 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 an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 12.
9	INSPECT ELECTRIC AT OIL PUMP • Remove the electric AT oil pump. (See ELECTRIC AT OIL PUMP REMOVAL/INSTALLATION [GW6A-EL, GW6AX-EL].) • Verify that the resistance at the electric AT oil pump is as follows: ? Between terminals D and A: approx. 18.2 k? ? Between terminals C and A: approx. 21.5 k? • Is the resistance normal?	Yes	Install the electric AT oil pump, then go to the next step. (See ELECTRIC AT OIL PUMP REMOVAL/INSTALLATION [GW6A-EL, GW6AX-EL].)
9		No	Replace the electric AT oil pump, then go to Step 12. (See ELECTRIC AT OIL PUMP REMOVAL/INSTALLATION [GW6A-EL, GW6AX-EL].)
10	INSPECT ELECTRIC AT OIL PUMP GROUND CIRCUIT FOR OPEN CIRCUIT • Verify that the electric AT oil pump connector is disconnected. • Inspect the wiring harness for continuity between electric AT oil pump terminal A (vehicle wiring harness side) and body ground. • Is there continuity?	Yes	Go to the next step.
10		No	Refer to the wiring diagram and verify whether or not there is a common connector between electric AT oil pump terminal A and body ground. 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 an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 12.
11	INSPECT ELECTRIC AT OIL PUMP CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the electric AT oil pump relay, electric AT oil pump, and TCM connectors are disconnected. • Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine on). • Measure the voltage at the following terminals (wiring harness-side): ? TCM terminal K ? TCM terminal L • Is the voltage 0 V?	Yes	Go to the next step.
11		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • TCM terminal K—Electric AT oil pump relay terminal E • TCM terminal L—Electric AT oil pump terminal C 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 the next step.
12	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Replace the fuse if it is blown. • Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (GW6A-EL, GW6AX-EL)].) • Perform the following procedure to ensure that the DTC has been resolved: 1. Operate i-stop for 10 s or more. • Perform the DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (GW6A-EL, GW6AX-EL)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (GW6A-EL, GW6AX-EL)].)
12		No	DTC troubleshooting completed.