Knock Sensor (Ks) System Check (Engine Knock, Poor Performance, Or Poor Economy) - Isuzu 1999 RODEO Workshop Manual

(Engine Knock, Poor Performance, or Poor Economy)
Circuit Description
The knock sensor (KS) sends an AC voltage signal to the
powertrain control module (PCM). As the KS detects
engine knock, the signal to the PCM changes in amplitude
and frequency. The PCM retards timing if the engine
speed is over 900 RPM.
Diagnostic Aids
If the KS system checks OK, but detonation is the
complaint, refer to Diagnosis, Detonation/Spark Knock.
(Engine Knock, Poor Performance, or Poor Economy)
Step
1 Is DTC P0325 or P0327 set?
2 Run the engine at 1500 RPM.
Is there an internal engine knock?
3 Repair the mechanical problem.
Is the action complete?
4 1. Install the Tech 2.
2. Turn the ignition "ON."
3. On the Tech 2 select F0: Data List, F4: Specific
Engine, F3: Misfire.
4. Cycle through the list until "Knock Retard" is
displayed.
Is knock retard at the specified value?
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Knock Sensor (KS) System Check
Knock Sensor (KS) System Check
Action
Test Description
The numbers below refer to the step numbers on the
Diagnostic Chart.
9. The change in signal speed depends on how hard
the tapping is done. Normally there is about 1.5 to
10 mV at PCM pin A2 with the engine off. Loud
tapping should be able to make the reading jump to
20-25 mV AC.
Value(s)
Go to DTC
P0325 or
DTC P0327
—
— Go to Step 3
— Verify repair
0° Go to Step 5
6E2–103
D06RW035–1
Yes No
Go to Step 2
Go to Step 4
—
Go to Step 6