Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was Le or rich, as well as other data from the time when a malfunction occurred.

Hand-held tester:

Connect hand-held tester, and read the voltage for accelerator pedal position sensor data.
PREPARATION:
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main switch ON.
3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2.
CHECK:

Read the voltage for the accelerator pedal position sensor data.

Fig 1: Identifying Accelerator Pedal Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Fig 2: Voltage Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) ).
2. NG: Go to Next Step.
Check for open and short in harness and connector between accelerator pedal position sensor and ECM.
PREPARATION:
1. Disconnect the A13 accelerator pedal position sensor connector.
2. Disconnect the E10 ECM connector.
CHECK:

Measure the resistance between the wire harness side connectors.

OK:

Standard (Check for open):

Fig 5: Resistance Reference Chart (Check For Open)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for short):

Fig 6: Resistance Reference Chart (Check For Short)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Repair or replace harness or connector.
2. OK: Replace accelerator pedal assembly.

OBD II scan tool (excluding hand-held tester):

Check voltage between terminals VPA and EPA, VPA2 and EPA2 of ECM connector.
PREPARATION:

Turn the ignition switch ON.

CHECK:

Measure the voltage between the specified terminals of the E10 ECM connector.

Fig 7: Checking Voltage Between Terminals VPA And EPA, VPA2 And EPA2 Of ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Fig 8: Voltage Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) ).
2. NG: Go to Next Step.
Check for open and short in harness and connector between accelerator pedal position sensor and ECM.
PREPARATION:
1. Turn the ignition switch ON.
2. Disconnect the A13 accelerator pedal position sensor connector.
CHECK:

Measure the voltage between the specified terminals of the E10 ECM connector.

Fig 9: Disconnecting A13 Accelerator Pedal Position Sensor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Fig 10: Voltage Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) ).
2. OK: Replace accelerator pedal assembly.

ECM Power Source Circuit

Check voltage between terminals +B and E1 of ECM connectors.
PREPARATION:

Turn the ignition switch ON.

CHECK:

Measure the voltage between terminals +B and E1 of the ECM connectors.

Fig 1: Checking Voltage Between Terminals +B And E1 Of ECM Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:
1. Voltage: 9 to 14 V
1. OK: Proceed to next circuit inspection shown on problem symptoms table (See TROUBLESHOOTING ).
2. NG: Go to Next Step.
Check for open in harness and connector between terminal E1 of ECM and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG: Repair or replace harness or connector.
2. OK: Go to Next Step.
Check voltage between terminal IGSW of ECM connector and body ground.
PREPARATION:

Turn the ignition switch ON.

CHECK:

Measure the voltage between terminal IGSW of the ECM connector and body ground.

Fig 2: Checking Voltage Between Terminal IGSW Of ECM Connector And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:
1. Voltage: 9 to 14 V
1. OK: Go to step 6 .
2. NG: Go to Next Step.
Check IGN fuse.
PREPARATION:

Remove the IGN fuse from the cowl side J/B RH.

CHECK:

Check the continuity of the IGN fuse.

Fig 3: Checking IGN Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:
1. Continuity
1. NG: Check for short in all harness and components connected to IGN fuse.
2. OK: Go to Next Step.
Check ignition switch (See INSPECTION ).
1. NG: Replace ignition switch.
2. OK: Check and repair harness and connector between battery and ignition switch, and ignition switch and ECM (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
Check voltage between terminal MREL of ECM connector and body ground.
PREPARATION:

Turn the ignition switch ON.

CHECK:

Measure the voltage between terminal MREL of the ECM connector and body ground.

Fig 4: Checking Voltage Between Terminal MREL Of ECM Connector And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:
1. Voltage: 9 to 14 V
1. NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) ).
2. OK: Go to Next Step.
Check EFI or ECD No. 1 fuse of engine room J/B.
PREPARATION:

Remove the EFI or ECD No. 1 fuse from the engine room J/B.

CHECK:

Check continuity of EFI or ECD No. 1 fuse.

Fig 5: Checking EFI Or ECD Fuse Of Engine Room J/B
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:
1. Continuity
1. NG: Check for short in all harness and components connected to EFI or ECD No. 1 fuse.
2. OK: Go to Next Step.
Check EFI or ECD relay (See EFI MAIN RELAY ).
1. NG: Replace EFI or ECD relay.
2. OK: Go to Next Step.
Check for open and short in harness and connector between terminal MREL of ECM and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG: Repair or replace harness or connector.
2. OK: Check and repair harness or connector between EFI or ECD No. 1 fuse and battery (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).