Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

The following troubleshooting flowchart is based on the premise that the engine is cranked normally. If the engine will not crank, proceed to the PROBLEM SYMPTOMS TABLE .
Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

READ DATA LIST (STARTER SIGNAL)

Connect an intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester ON.
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / STARTER SIG.

Check the value displayed on the tester when the ignition switch is turned to the ON and START positions.

Result

RESULT REFERENCE CHART

Ignition Switch Positions	STARTER SIG
ON	OFF
START	ON

OK : REPLACE ECM

NG: Go to Next Step

INSPECT PARK / NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH ASSEMBLY

Inspect the Park/Neutral Position (PNP) switch (for A/T models).

Disconnect the P1 PNP switch connector.

Check the resistance when the transmission gear selector lever is moved to each position.

Standard Resistance

RESISTANCE REFERENCE CHART

Gear Selector Lever Positions	Tester Connections	Specified Conditions
P	2 - 6, 4 - 5	Below 1 Ω
R	1 - 2	Below 1 Ω
N	2 - 9, 4 - 5	Below 1 Ω
D	2 - 7	Below 1 Ω
2	2 - 3	Below 1 Ω
L	2 - 8	Below 1 Ω

Reconnect the PNP switch connector.

Fig 1: Identifying PNP Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Inspect the clutch start switch (for M/T models).

Disconnect the C8 clutch start switch connector.

Check the resistance when the clutch start switch is ON and OFF.

Standard Resistance

RESISTANCE REFERENCE CHART

Ignition Switch Positions	Tester Connections	Specified Conditions
ON (pushed)	1 - 2	Below 1 Ω
OFF (free)	1 - 2	10 kΩ or higher

Reconnect the clutch start switch connector.

Fig 2: Inspecting Clutch Start Switch (For M/T Models)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE PARK / NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH ASSEMBLY (GO TO STEP 3 AFTER REPLACEMENT)

OK: Go to Next Step

READ DATA LIST (STARTER SIGNAL)

Connect the intelligent tester to the DLC3.
turn the ignition switch to ON and turn the tester ON.
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / STARTER SIG.

Check the value displayed on the tester when the ignition switch is turned to the ON and START positions.

Result

RESULT REFERENCE CHART

Ignition Switch Positions	STARTER SIG
ON	OFF
START	ON

OK : SYSTEM OK

NG: Go to Next Step

INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

Disconnect the 17 ignition switch connector.

Check the resistance.

Fig 3: Identifying Ignition Switch Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard Resistance

RESISTANCE REFERENCE CHART

Ignition Switch Positions	Tester Connections	Specified Conditions
LOCK	All Terminals	10 kΩ or higher
ACC	2-4	Below 1 Ω
ON	1-4, 1-6, 2-4, 3-4, 5-6	Below 1 Ω
START	1-4, 3-4, 5-6, 5-7	Below 1 Ω

Reconnect the ignition switch connector.

NG: REPLACE IGNITION OR STARTER SWITCH ASSEMBLY (GO TO STEP 5 AFTER REPLACEMENT)

OK: Go to Next Step

READ DATA LIST (STARTER SIGNAL)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester ON.
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / STARTER SIG.

Check the value displayed on the tester when the ignition switch is turned to the ON and START positions.

Result

RESULT REFERENCE CHART

Ignition Switch Positions	STARTER SIG
ON	OFF
START	ON

OK : SYSTEM OK

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR