6E1-62 DRIVEABILITY AND EMISSIONS
ELECTRONIC IGNITION SYSTEM
DIAGNOSIS
If the engine cranks but will not run or immediately
stalls, the Engine Cranks But Will Not Start chart
must be used to determine if the failure is in the
ignition system or the fuel system. If DTC19, or
DTC18 is set, the appropriate diagnostic trouble code
chart must be used for diagnosis.
If a misfire is being experienced refer to the
Symptoms section for diagnosis.
EVAP CANISTER PURGE CONTROL
SOLENOID (IF APPLICABLE)
A continuous purge condition with no purge
commanded by the ECM will set a DTC62. Refer to
the DTC charts for further information.
VISUAL CHECK OF THE
EVAPORATIVE EMISSION CANISTER
(IF APPLICABLE)
• If the canister is cracked or damaged, replace the
canister.
• If fuel is leaking from the canister, replace the
canister and check hoses and hose routing.
IDLE AIR CONTROL (IAC) VALVE
The Scan Tool displays the IAC pintle position in
counts. A count of “O” indicates the ECM is
commanding the IAC pintle to be driven all the way
into a fully-seated position. This is usually caused by
a vacuum leak.
The higher the number of counts, the more air is
being commanded to bypass the throttle blade. Refer
to IAC System Check in order to diagnose the IAC
system. Refer to Rough, Unstable, or Incorrect Idle,
Stalling in Symptoms for other possible causes of idle
problems.
FUEL SYSTEM PRESSURE TEST
A fuel system pressure test is part of several of the
diagnostic charts and symptom checks. To perform
this test, refer to Fuel System Diagnosis.
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