Toyota 2002 Camry - Check and Replace ECU

IN0383
Example
Ground
IN0384
Ground
ECU Side
W/H Side
Ground
–INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
01–35
35Author: Date:
2002 CAMRY REPAIR MANUAL (RM881U)
4. CHECK AND REPLACE ECU
NOTICE:
 Start an inspection of the connector from the back-
side of the connector at the wire harness side with the
connector connected to the ECU.
 When no measuring condition is specified, perform
the inspection with the engine stopped and also the
ignition switched ON.
(a) First check the ECU ground circuit. If it is faulty, repair it.
If it is normal, the ECU could be faulty So, replace the
ECU with a normal functioning one and check if the symp-
toms appear.
(1) Measure the resistance between the ECU ground
terminal and body ground.
Resistance: 1 Ω or less
(2) Disconnect the ECU connector, check the ground
terminals on the ECU side and wire harness side for
bend and check the contact pressure.