Engine Control System (4HK1) 1A-327
7
Drive the vehicle. (Lift the driving wheels as
necessary)
Does the engine warm up control cancel?
—
System OK
Observe the Vehicle
Speed parameter.
Refer to DTC P0500
8
Observe the Engine Warm Up Switch parameter
with a scan tool.
Does the scan tool indicate ON?
—
Go to Step 9 Go to Step 10
9
Observe the Exhaust Brake Valve Command
parameter with a scan tool.
Does the scan tool indicate ON?
—
Problem is relating
either solenoid
valves, exhaust
brake valve or
vacuum pressure
lines. Go to Exhaust
Brake Control
System Check
The ECM is not
allowing engine
warm up control.
Refer to Engine
Warm Up Control
Operation
10
1. Turn OFF the ignition.
2. Remove the bezel surrounding the instrument
panel (IP) cluster enough to disconnect the
engine warm switch.
3. Disconnect the engine warm up switch
harness connector.
4. Connect a test lamp between the voltage feed
circuit of the switch harness (pin 1 of B-168)
and a known good ground.
5. Start the engine.
Does the test lamp illuminate?
—
Go to Step 11 Go to Step 12
11
Observe the Engine Warm Up Switch parameter
with a scan tool while momentarily jumping 3-amp
fused jumper wire across the switch harness
connector between pins 1 and 2 of B-168.
Does the scan tool indicate ON when the
circuit is jumpered and OFF when the circuit is
not jumpered?
—
Go to Step 14 Go to Step 13
12
Repair the open circuit or high resistance between
the ECM (10A) fuse and the switch (pin 3 of B-168).
Did you complete the repair?
—
Go to Step 20
—
13
1. Test the signal circuit between the ECM (pin
51 of J-14) and the switch (pin 2 of B-168) for
an open circuit or high resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 20 Go to Step 15
14
1. Inspect for an intermittent and for poor
connections at the harness connector of the
switch (pins 1 and 2 of B-168).
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 20 Go to Step 18
15
1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for a poor
connection at the harness connector of the
ECM (pin 51 of J-14).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 20 Go to Step 19
Step Action Value(s) Yes No
LG4HKED-WE-0871.book 327 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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