Workshop Manual

TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–11
Diagnosis
Electronic Diagnosis
How To Diagnose The Problem
1.To avoid incorrect diagnostics, this book needs to be
followed accurately. Unless stated, do not jump
directly to a section that could contain the solution.
Some important information may be missed.
2.The sections in CAPITALS and bold are the main
sections that can be found in the contents.
3.The GO TO “SECTION” means to continue to check
going to the “section”.
4.The GO THROUGH “SECTION” means to go
through the “section” and then to go back to the place
the GO THROUGH was written.
5.BASIC ELECTRIC CIRCUITS:
You should understand the basic theory of electricity.
This includes the meaning of voltage, amps, ohms,
and what happens in a circuit with an open or shorted
wire. You should also be able to read and understand
wiring diagrams.
Check Trans Indicator
Find CHECK TRANS indicator and verify if it is
A. Flashing: GO TO DIAGNOSTIC CHECK.
B. Staying on: GO THROUGH CHECK TRANS
CHECK.
C. Is never ON when the ignition key is turned on: GO
THROUGH CHECK TRANS CHECK
D. Is ON during 2 seconds at ignition but OFF after:
Normal operation. No DTC or malfunction.
821R200014
Diagnostic Check
This test determines if the transmission or its input or
output connections or sensors are failing.
1.Connect the Tech 2: GO THROUGH Tech 2 OBD II
CONNECTION.
2.Turn on the ignition but not the engine.
3.Push “F0” on Tech 2 to see the Diagnostic Trouble
Code (DTC):
4.Do you have a DTC?
YES: write down all code numbers and do the DTC
CHECK
NO: the DTC can not help you finding the problem.
1. GO THROUGH “CHECK TRANS” CHECK
2. If it is flashing and the flash is 0.2 seconds ON and
0.2 seconds OFF, this means that you should
have a DTC stored. Please recheck GO TO
DIAGNOSTIC CHECK and if you find the same
problem, replace the Powertrain Control Module
(PCM).
Normal
C07R200005
Abnormal
C07R200006