Diesel Electrical System Diagnosis; Pre-Heating System - Toyota 1PZ Repair Manual

EM-14 ENGINE MECHANICAL - Troubleshooting (Diesel Electrical System Diagnosis)

Diesel Electrical System Diagnosis

ENGINE DOES NOT START COLD
HINT:
• Battery voltage at least 12 V (or 24 V) - starter switch OFF.
• Engine cranks normally.
• Fusible link okay.
• Check the voltage marked with an asterisk (.) just as the starter switch is placed at ON because the voltage
will change.
1. Pre-Heating System (Super Glow Type)
Disconnect the water temperature
sensor.
Check if indicator light lights up
with starter switch ON.
Light on: 6 - 7 seconds
Yes
Starter switch OFF
*Check for battery voltage to
terminal 1 of pre-heating timer
with starter switch ON.
Voltage
*Check if voltage to terminal 1 of
pre-heating timer is terminated
after engine is started.
Yes
Starter switch OFF.
CONTINUED ON PAGE EM-15
Check fuse.
No (See page ST-2)
Fuse OK
Check indicator
light bulb.
Bulb OK
Check for battery voltage to terminal 3 of pre-heating
timer connector (on wire harness side).
If okay, pre-heating timer is faulty and should be
replaced.
*Check that there is 1 V or less to terminal 9.
No If okay, timer is faulty and should be replaced.
Voltage
Start engine and check/if there is a voltage at terminal
No 9 of pre-heating timer.
If faulty, repair charging system as necessary.
If okay, timer is faulty and should be replaced.
Check for short circuit
Fuse and repair if necessary.
Blown
Replace bulb.
Bulb
No Good
Pre-Heating Timer
6 5 4 3 1
11 109 7
ST0049