Isuzu engine C22NE / 22LE / 20LE. Manual — part 66
DRIVEABILITY AND EMISSIONS 6E1-93
Rough, Unstable, or incorrect Idle, Stalling Sympton (For Closed Loop System)
Step
Action
Value(s)
Yes
No
12
1. Reconnect the fuel pump relay.
2. Disconnect the fuel pump electrical connector at the
fuel tank.
3. Using a test light connected to ground, probe the fuel
pump feed wire (harness side).
4. Command the fuel pump ON with a scan tool.
Did the light illuminate for 2 seconds?
-
Go to Step 15
Go to Step 13
13
1. Honk the horn to verify that horn relay is functioning.
2. Susbstitute the horn relay for the fuel pump relay.
3. Leave the test light connected as in step 12.
4. Command the fuel pump ON with the scan tool.
Did the test light illuminate for 2 seconds when the fuel
pump was commanded ON?
-
Go to Step 17
Go to Step 14
14
1. Re-connect the horn relay in its proper location.
2. Check for a short circuit, blown fuse or open circuit
between the relay and the fuel tank.
Is the action complete?
-
Verify repair
-
15
1. with the fuel pump electrical connector at the fuel tank
disconnected, connect a test light between the feed
wire and the ground wire (harness side).
2. Command the fuel pump ON with a scan tool.
Did the test light illuminate for 2 seconds.
-
Go to Step 18
Go to Step 16
16
Repair the open circuit in the fuel pump ground wire.
Is the action complete?
-
Verify repair
-
17
1. Re-connect the horn relay in its proper location.
2. Replace the fuel pump relay.
Is the action complete?
-
Verify repair
-
18
Replace the fuel pump.
Is the action complete?
-
Verify repair
-
6E1-94 DRIVEABILITY AND EMISSIONS
Idle CO Concentration Check and
adjustment
1.
Before starting adjusting work, check and confirm the
following conditions.
Normal engine operating temperature.
All accessories switched off.
Throttle valve closed.
Transmission in neutral.
2.
Before starting adjusting work, step on accelerator pedal
a few times and do racing up to 3000rpm.
3.
After taking foot off accelerator pedal, short out pins #5 +
#6 of ALDL Connector(Fixed under center console panel)
short.
(When you do this, Check Engine Lamp will blink, and
engine rpm will rise to 100 to 1600rpm)
4.
In this condition, connect CO meter with Tail Pig and
check CO value(%).
5.
If CO value is within the range shown below, leave as it
is. If it is out of range, adjust I t by turning the screw of
CO Adjuster.
(After adjusting, confirm that CO value becomes stable.)
Note: After adjusting work is finished, apply the liquid gasket to
the CO adjuster screw. And after that, all conditions to
restore to former state.
Regulated range of CO concentration value:
1.0
+0.2
- 0.5
DRIVEABILITY AND EMISSIONS 6E1-95
Poor Fuel Economy Symptom
Step
Action
Value(s)
Yes
No
DEFINITION: Fuel economy, as measured by an actual road test, is noticeably lower than expected. Also, economy
is noticeably lower than it was on this vehicle at one time, as previously shown by an actual road test.
1
Was the On-Board Diagnostic (OBD) System Check
performed?
-
Go to Step 2
Go to OBD
System
Check
2
1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
-
Verify Repair
Go to Step 3
3
Was a visual/physical check performed?
-
Go to Step 4
Go to
Visual/Physic
al Check
4
Check owner's driving habits.
• Is the A/C On full time (defroster mode ON)?
• Are tires at the correct pressure?
• Are excessively heavy loads being carried?
• Is acceleration too much, too often?
-
Go to Step 5
Go to Step 6
5
Review the items in Step 4 with the customer and advise
as necessary.
Is the action complete?
-
System OK
-
6
1. Visually/Physically check: Vacuum hoses for splits,
kinks, and improper connections and routing as shown
on the "Emission Control System schematics".
Was a problem found?
-
Verify repair
Go to Step 7
7
Remove and check the air filter element for dirt or for
restrictions.
Was a problem found?
-
Verify repair
Go to Step 8
8
1. Remove the spark plugs and check for gas or oil
fouling cracks, wear, improper gap, burned electrodes
of heavy deposits.
2. Is spark plugs are fouled, the cause of fouling must be
determined before replacing the spark plugs.
Was a problem found?
-
Verify repair
Go to Step 9
9
Check for low engine coolant level.
Was a problem found?
-
Verify repair
Go to Step 10
10
Check for an incorrect or faulty engine thermostat.
Refer to Engine Cooling.
Was a problem found?
-
Verify repair
Go to Step 11
11
Check for low engine compression. Refer to Engine
Mechanical.
Was a problem found?
-
Verify repair
Go to Step 12
6E1-96 DRIVEABILITY AND EMISSIONS
Poor Fuel Economy Symptom (Cont'd)
Step
Action
Value(s)
Yes
No
12
Check for proper calibration of the speedometer.
Does the speed indicated on the speedometer closely
match the vehicle speed displayed on the Scan Tool?
-
Go to Step 14
Go to Step 13
13
Diagnose and repair the inaccurate speedometer condition
as necessary. Refer to Vehicle Speed Sensor in Electrical
Diagnosis.
-
Verify repair
-
14
Check the air intake system and the crankcase for air
leaks.
Was a problem found?
-
Verify repair
Go to Step 15
15
1. Review all the diagnostic procedures within this table.
2. If all procedures have been completed and no
malfunctions have been found, review/inspect the
following:
• Visual/physical inspection
• Scan tool data
• All electrical connections within a suspected circuit
and/or system
Was a problem found?
-
Verify repair
Go to Step 16
16
Perform the procedure in Fuel System Pressure Test.
Was the fuel pressure normal?
-
Contact
Technical
Assistance
Verify repair
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