3.1.13-48
CS35 2013.04
3.1.13-48Electronic Control System - ME7
Engine Unstable Running Diagnosis
Test Conditions Details/Results/Actions
1. Inspect the trouble code
A. Connect the diagnostic tool.
B. Turn the ignition switch to position "ON", diagnose
the engine system.
Is there any DTC?
Y
Go to trouble code diagnosis procedure.
Refer to: DTC Diagnostic Procedure Index
(3.1.13 Electrical Control System - ME7,
DTC Diagnosis and Testing).
N
Go to step 2.
2. Inspect the air intake system
A. Turn the ignition switch to position "LOCK".
B. Inspect the air intake system for block.
Refer to: Symptom Chart (3.1.5 Intake
System, Symptom Diagnosis and Testing).
C. Inspect the air intake system for leakage.
Refer to: Air Intake System Leakage Diag-
nosis Procedures (3.1.5 Intake System,
Symptom Diagnosis and Testing).
Is the air intake system normal?
Y
Go to step 3
N
Repair the air intake system.
3. Inspect the oxygen sensor
A. Connect the diagnostic tool.
B. Turn the ignition switch to position "ON", operate
diagnostic tool to access to the engine data stream
and read "pre - catalytict oxygen sensor pressure
and post - catalytict oxygen sensor pressure".
Is the data stream normal?
Y
Go to step 4.
N
Repair or replace the pre - catalytic oxygen sensor
and the circuit.
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