Engine Control System (4JJ1) 1A-303
Glow Control System Check
Description
The glow control system consists of the ECM, the glow
relay, the glow plug lamp and glow plugs. The glow
control system is operated when the engine coolant
temperature is low, which allows easier engine starting.
The ECM commands the glow relay ON for a certain
length of time at ignition switch is ON with engine OFF.
In after glow phase, the glow plugs remain energized
for a certain period with engine run.
Glow Control Operation
• The glow plug lamp illuminates between 0.5
seconds to approximately 10 seconds depending
upon the engine coolant temperature. It illuminates
0.5 seconds at 10°C (50°F) or more.
• In pre glow phase, the glow relay energizes
between 1 second to approximately 25 seconds
depending upon the engine coolant temperature. It
energizes 1 second at 10°C (50°F) or more.
• In after glow phase, the glow relay energizes
between 1 second to approximately 20 seconds
depending upon the engine coolant temperature. It
energizes 1 second at 10°C (50°F) or more.
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing Glow Control System Check
Step Action Value(s) Yes No
1
Did you perform the Diagnostic System Check -
Engine Controls? —
Go to Step 2
Go to Diagnostic
System Check -
Engine Controls
2
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Monitor the DTC Information with a scan tool.
Is DTC P0117, P0118, P0380 or P0381 set?
—
Go to Applicable
DTC Go to Step 3
3
1. Turn OFF the ignition.
2. Make sure the metal bus bar that connects
switched battery voltage supply terminal (E14)
and all glow plugs is secured tightly.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the metal bus
bar (glow plug power supply E14 terminal) and
a known good ground.
5. Perform the Glow Relay Control with a scan
tool.
6. Command the relay ON while observing the
test lamp.
Does the test lamp turn ON only when commanded
ON?
—
Go to Step 4 Go to Step 5
4
1. Turn OFF the ignition.
2. Remove the metal bus bar from the glow
plugs.
3. Measure resistance of each glow plug
between the glow plug terminals and a known
good ground. Make sure to record all
measurements and take them quickly as to
not allow engine temperature changes
between measurements.
Are the resistances within the specified value each
other?
1 Ω
System OK Go to Step 15
LG4JJED-WE-0871.book 303 ページ ２００８年４月４日 金曜日 午前９時６分
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