ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-67
Fig. 1 for Step 3 Fig. 2 for Step 4 Fig. 3 for Step 5
Fig. 4 for Step 6
1. Throttle body
2. Fuel feed hose
Good
No good
STEP ACTION YES NO
8 Check engine coolant temp. sensor for performance
(See Section 6E1).
Is it in good condition?
Go to Step 9. Replace engine
coolant temp. sensor.
9 Check intake air temp. sensor for performance
(See Section 6E1).
Is it in good condition?
Go to Step 10. Replace intake air
temp. sensor.
10 Check throttle position sensor for performance (See
Step 4 of DTC P0121 Diag. Flow Table).
Is it in good condition?
Go to Step 11. Replace throttle
position sensor.
11 Check PCV valve for valve clogging (See Section
6E1).
Is it good condition?
Substitute a known-
good ECM (PCM) and
recheck.
Replace PCV valve.
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