Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE (ECU-IG No. 1)

Remove the ECU-IG No. 1 fuse from the main body ECU.

Measure the resistance according to the value(s) in the table below.

Standard resistance

FUSE (ECU-IG No. 1) RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
ECU-IG No. 1 fuse	Always	Below 1 Ω

NG: REPLACE FUSE

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ACCESSORY METER - BATTERY)

Disconnect the K20 meter connector.

Measure the voltage according to the value(s) in the table below.

Standard voltage

HARNESS AND CONNECTOR (ACCESSORY METER - BATTERY) VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
K20-23 (IG) - Body ground	Ignition switch ON	11 to 14 V

Fig 1: Identifying K20 Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ACCESSORY METER - ECU)

Disconnect the J35 ECU connector.
Disconnect the K20 meter connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance

HARNESS AND CONNECTOR (ACCESSORY METER - ECU) RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
J35-15 (L1) - K20-3 (RR)	Always	Below 1 Ω
J35-16 (L2) - K20-4 (FR)	Always	Below 1 Ω
J35-17 (L3) - K20-7 (RL)	Always	Below 1 Ω
J35-18 (L4) - K20-8 (FL)	Always	Below 1 Ω
J35-19 (L5) - K20-5 (BK)	Always	Below 1 Ω
J35-20 (L6) - K20-6 (OP)	Always	Below 1 Ω
J35-15 (L1) - Body ground	Always	10 kΩ or higher
J35-16 (L2) - Body ground	Always	10 kΩ or higher
J35-17 (L3) - Body ground	Always	10 kΩ or higher
J35-18 (L4) - Body ground	Always	10 kΩ or higher
J35-19 (L5) - Body ground	Always	10 kΩ or higher
J35-20 (L6) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying J35 ECU And K20 Meter Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

REPLACE ACCESSORY METER ASSEMBLY
1. Replace the accessory meter with a normally functioning or new accessory meter (see REMOVAL ).
2. Check that the accessory meter indicator operates normally.
  OK: Accessory meter indicator operates normally.
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

OK: END (ACCESSORY METER IS DEFECTIVE)