213
TROUBLESHOOTING
3. Check temperature sensor readings
21) Check Ignition Timing
1) Check outside air temperature and engine compart-
ment temperature with the monitor mode of the
board maintenance functions.
2) Measure actual temperature with a thermometer,
and check for the sensor reading's extreme devia-
tion from the actual temperature.
3) Measure each sensor's resistance value at the
terminals on the main PCB, and check for extreme
deviation from the standard value.
Code No.
Outside air temperature No. 4d
Engine compartment
temperature
No. 50
Measure point (on main PCB)
Outside air temperature CN6[9]-[10]
Engine compartment
temperature
CN6[13]-[14]
Temperature Standard resistance value
14 ℉ (-10 ℃ ) 23.7 kΩ
32 ℉ (0 ℃ ) 15.0 kΩ
50 ℉ (10 ℃ ) 9.8 kΩ
68 ℉ (20 ℃ ) 6.5 kΩ
86 ℉ (30 ℃ ) 4.4 kΩ
104 ℉ (40 ℃ ) 3.1 kΩ
122 (50 ℃ ) 2.2 kΩ
[ 8 TON only ]
1. Connect a pickup clip of a timing light to the high
voltage cable of the No. 1 cylinder.
2. Check the ignition timing by aiming the timing light
at the timing scale located behind the crank pulley
on the front side of the engine.
Engine speed Ignition timing
1,200 rpm (min
-1
)17° ± 3°
High voltage
cable 1
Timing light
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