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.

Check ECM.
NOTE: With this inspection, ECM CPU can be diagnosed if it works normally or not.

CHECK: that the engine starts normally.
1. NG: Replace the ECM.
2. OK: Go to 2.
Check wire harness
PREPARATION: Disconnect connector "B8" of body ECU, "E11" of ECM and "G1" of gateway ECU.

Fig 1: Testing Wire Harness Body ECU To ECM & ECM To Gateway ECU For Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK
1. Check continuity between terminals MPX- of body ECU and MPX2 of ECM.
2. Check continuity between terminals MPX1 of ECM and MPX1 of gateway 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 ECM.