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.

READ VALUE OF INTELLIGENT TESTER (ENGINE SPEED)
1. Connect an intelligent tester to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester ON.
4. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ENGINE SPD.
5. Read the value displayed on the tester.
  OK: Engine speed displayed on the tester is almost the same as the actual engine speed.
NG: GO TO ENGINE CONTROL SYSTEM (1GR-FE) OR ENGINE CONTROL SYSTEM (2TR-FE)

OK: Go to next step

INSPECT COMBINATION METER ASSEMBLY

Inspect the combination meter using an oscilloscope.

While the engine is running, check the waveform between the terminals of the C9 combination meter connector and body ground.

Standard

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
C9-7 - Body ground	Correct waveform shown

OK: REPLACE COMBINATION METER ASSEMBLY

Fig 1: Disconnecting C9 Combination Meter Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

Disconnect the C9 combination meter connector.
Disconnect the E7 ECM connector.

Measure the resistance.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
C9-7 - E7-1	Below 1
C9-7 or E7-1 - Body ground	10 k or higher

Reconnect the ECM connector.
Reconnect the combination meter connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Disconnecting E7-1 & C9 Combination Meter Connector

OK: REPLACE ECM