Troubleshooting
Troubleshooting Guide
NOTE: Across each row in the chart, the systems that could be sources of a symptom are ranked in the order they
should be inspected starting with . Find the symptom in the left column, read across to the most likely source, then
refer to the page listed at the top of that column. If inspection shows the system is OK, try the next most likely system
, etc.
* If codes other than those listed above are indicated, count the number of blinks again. If the indicator is in fact blinking
these codes, substitute a known-good ECU and recheck. If the indication goes away, replace the original ECU.
: If the Check Engine light is on while the engine is running, jump the service check connector. If no code is
displayed (Check Engine light stays on steady), the back-up system is in operation.
Substitute a known-good ECU and recheck. If the indication goes away, replace the original ECU.
PAGE
26 30, 32, 36 40 46 48 50 52 54 56 6-15
Troubleshooting Guide
NOTE: Across each row in the chart, the systems that could be sources of a symptom are ranked in the order they
should be inspected starting with . Find the symptom in the left column, read across to the most likely source, then
refer to the page listed at the top of that column. If inspection shows the system is OK, try the next most likely system
, etc.
* If codes other than those listed above are indicated, count the number of blinks again. If the indicator is in fact blinking
these codes, substitute a known-good ECU and recheck. If the indication goes away, replace the original ECU.
: If the Check Engine light is on while the engine is running, jump the service check connector. If no code is
displayed (Check Engine light stays on steady), the back-up system is in operation.
Substitute a known-good ECU and recheck. If the indication goes away, replace the original ECU.
PAGE
26 30, 32, 36 40 46 48 50 52 54 56 6-15
Main Menu Table of Contents
Ó
PGM~FI IDLE CONTROL FUEL SUPPLY EMISSION CONTROL
VALVE ELEC- Am
TIMING OIL ⋎⋤⋮↾⋮↿⋮∣⋮⋮∶∣⊓−⋮ Emmy KNOCK A/TFI AIT Fl TRONICAIR OHS“ FUEL FUEL FUEL ∘⊧⊤⋃⊦⇥⋮⋮∟∏ INTAKE ∁∘⋮⇃≺∓↾∣≦∘∣∙ ⋮∣⇖⋖≩∣⊺∋∣↨⋚≣∥
PRESSURE SENSOR ADJUSTER SENSOR SIGNALA SIGNALB CONTROL CONTROLS INJECTOR METERING PUMP SUPPLY SYSTEM CONTROLS
SWITCH VALVE
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11-17