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Fuel and Emissions Systems
Symptom Troubleshooting Index
When the vehicle has one of these symptoms, check the diagnostic trouble code (DTCI with the scan tool. If there is no
DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.
Symptom
I
Diagnostic procedure
Also check for
Engine will not start
~ 1.
Test the battery (see page 22-501.
·
Low compression
IMIL works OK, no DTCs set I
2.
Test the starter Isee page 4-81.
• No ignition spark
3.
Troubleshoot the fuel pump circuit Isee page 11-
• Intake air leaks
141).
• Locked up engine
,
• Broken timing chain
• Contaminated fuel
Engine will not start IMIL
Troubleshoot the MIL circuit Isee page 11-971.
comes on and stays on, or
never comes on at all, no
,
,
DTCs setl
Engine will not start
Troubleshootthe immobilizer system Isee page 22-1651. '
(immobilizer indicator stays
,
on or flashsl
Hard starting
1. Test the battery (see page 22-50).
• Low compression
(MIL works OK, no DTCs setl
2.
Check the fuel pressure Isee page 11-1451.
• Intake air leaks
• Contaminated fuel
Cold fast idle too low
1.
Do the ECM idle learn procedure Isee page 11-1391.
IMIL works OK, no DTCs set I
!
2.
Check the idle speed Isee page 11-1381.
Cold fast idle too high
1.
Do the ECM idle learn procedure (see page 11-1391.
(MIL works OK, no DTCs setl
2.
Check the idle speed (see page 11-1381.
3.
Inspect/adjust the throttle cable Isee page 11-1631.
4.
Inspect andtestthe throttle body (see page 11-1601.
Idle speed fluctuates
1.
Do the ECM idle learn procedure (see page 11-1391.
Intake air leaks
IMIL works OK, no DTCs setl
2.
Check the idle speed Isee page 11-1381.
3.
Inspect/adjust the throttle cable (see page 11-1631.
4.
Inspect and test the throttle body Isee page 11-1601
After warming up, idle speed
1.
Do the ECM idle learn procedure Isee page 11-1391.
Vacuum hose clogged/
is below specifications with
2.
Troubleshootthe alternator FR signal circuit (see
I
cracked/poor
no load
page 11-1341.
connection
IMIL works OK, no DTCs setl
3.
Inspect and test the throttle body Isee page 11-1601.
After warming up, idle speed
1.
Do the ECM idle learn procedure Isee page 11-1391.
is above specifications with
2.
Troubleshoot the alternator FR signal circuit (see
no load
IMIL works OK, no DTCs set I
page 11-1341.
,
Low power
1.
Check the fuel pressure (see page 11-1451.
• Low compression
IMIL works OK, no DTCs setl
2.
Inspect and testthe throttle body Isee page 11-1601.
• Camshaft timing
3.
Inspect/adjust the throttle cable Isee page 11-1631.
problem
• Engine oil level
problem
Engine stalls
1.
Do the ECM idle learn procedure Isee page 11-1391.
• Intake air leaks
,
IMIL works OK, no DTCs setl
,
2.
Check the fuel pressure Isee page 11-1451.
• Faulty harness and
3.
Check the idle speed (see page 11-1381.
sensor connections
I
4.
Troubleshootthe brake pedal position switch signal
I
circuit Isee page 11-137).
i
11-10
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Troubleshooting
