Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: With this inspection, the combination meter ECU CPU can be diagnosed if it works normally or not.

Check combination meter ECU.
CHECK: Start the engine and check that the speed meter and tachometer operate normally.
1. NG: Replace the combination meter ECU.
2. OK: Go to 2.
Check wire harness

Fig 1: Testing Wire Harness To A/C Amplifier To Combination Meter & Combination Meter To Body ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

PREPARATION: Disconnect connector "A7" of A/C amplifier, "C11" of combination meter ECU and "B8" of body ECU.

CHECK
1. Check continuity between terminals MPX+ of A/C amplifier and MPX- of combination meter ECU.
2. Check continuity between terminals MPX+ of combination meter ECU and MPX1 of body ECU.
OK: There is a continuity in wire harness of both ( a and ( b, or either ( a or ( b.

NOTE: If there is OPEN in wire harness of either ( a or ( b, please repair it.
1. NG: Repair or replace wire harness.
2. OK: Replace the combination meter ECU.