Isuzu engine C22NE / 22LE / 20LE. Manual — part 62
DRIVEABILITY AND EMISSIONS 6E1-77
Diagnosis
;;
;;
;;
;;;
;
;
1
7
5
6
2
3
4
Legend
(1) Intake Manifold
(2) Fuel Vapor Purge Control Solenoid
(3) Fuel Vapor Canister
(4) Check and Relief valve
(5) Fuel Tank
(6) Pressure/ Vacuum Vented
(7) Rollover Valve
Visual Check of Canister
Cracked or damaged, replace canister.
6E1-78 DRIVEABILITY AND EMISSIONS
Evaporative Emission Canister Purge Control Solenoid Valve Check (If applicable)
ENGINE
CONTROL
MODULE
(ECM)
ENGINE FUSE
15A
IGNITION
EVAPORETIVE
EMISSION
CANISTER PURGE
SOLENOID
CONTROL DRIVER
EVAPORATIVE
EMISSION
CANISTER
PURGE CONTLOL
SOLENOID VALVE
1
2
N.C.
MANIFOLD
VACUUM
TO CANISTER
Circuit Description:
The EVAP canister purge is controlled by a solenoid
valve that allows the manifold vacuum to purge the
canister. The engine control module (ECM) supplies a
ground to energize the solenoid valve (purge on). The
EVAP purge solenoid control is pulse- width
modulated (PWM) (turned on and off several times a
second). The duty cycle (pulse width) is determined by
engine operating conditions including load, throttle
position, coolant temperature and ambient
temperature. The duty cycle is calculated by the ECM.
The output is commanded when the appropriate
conditions have been met. These condi-tions are:
• The engine is fully warmed up.
• The engine has been running for a specified time.
• The IAT reading is above 10°C (50°F).
The EVAP purge vacuum switch is a normally closed
switch positioned in the purge line between the
canister and the EVAP purge control solenoid valve.
A continuous purge condition with no purge
commanded by the ECM will set a DTC62.
Poor idle, stalling and poor driveability can be caused
by:
• A malfunctioning purge solenoid.
• A damaged canister.
• Hoses that are split, cracked, or not connected
properly.
Test Description:
Numbers below refer to circled numbers on the
diagnostic chart.
1. Check to see if the solenoid is opened or closed.
The solenoid is normally de-energized in this step,
so it should be closed.
2. Check to determine if solenoid was open due to
electrical CKT problem or defective solenoid.
3. Completes functional check by grounding test
terminal. This should normally energize the
solenoid opening the valve which should allow the
vacuum to drop (purge “ON“).
Diagnostic Aids:
Make a visual check of vacuum hose(s). Check
throttle body for possible cracked, or plugged vacuum
block.
Malfunction indicator lamp for possible mechanical
problem.
DRIVEABILITY AND EMISSIONS 6E1-79
General Description
Legend
(1) Filler Cap
(2) Fuel Tank
(3) Rollover Valve
(4) Fuel Pump
(5) Fuel Filter
(6) Fuel Rail
(7) Intake Manifold
(8) Fuel Pressure Regulator
(9) Duty Solenoid Valve (Evap. Purge Control
Solenoid)
(10) Throttle Valve
(11) Canister
(12) Check and Relief Valve
(13) Drain Hose
(14) 2 Way Valve
6E1-80 DRIVEABILITY AND EMISSIONS
ECM Diagnostic Trouble Codes
The following table lists the diagnostic trouble codes
supported a Tech 2 and to flash. If any DTCs not listed
here are displayed by a Tech 2, the Tech 2 data may
be faulty; notify the Tech 2 manufacturer of any DTCs
displayed that are not included in the following table.
ECM Diagnostic Trouble Codes
DTC
using a
Tech 2
Flash DTC
Description
Illuminate MIL
22
22
Throttle position low
yes
21
21
Throttle position high
yes
13
13
Oxygen sensor not ready (If applicable)
yes
44
44
Oxygen sensor too lean (If applicable)
yes
45
45
Oxygen sensor rich too long (If applicable)
yes
14
14
Coolant High
yes
15
15
Coolant Low
yes
16
16
Knock sensor disconnected circuit open
yes
18
18
Digital Signal to Noise Enhancement Filter failure
yes
19
19
58X signal incorrect
yes
24
24
Vehicle Speed Senser fault
yes
33
33
Manifold Absolute Pressure Sensor too high
yes
34
34
MAP too low
yes
49
49
Batt voltage too high
yes
69
69
Intake Air Temp. Sensor too high
yes
71
71
IAT too low
yes
17
17
Injector malf
yes
41
41
Coil Driver B short to battery
yes
42
42
Coil Driver A short to battery
yes
63
63
Coil Driver B short to ground
yes
64
64
Coil Driver A short to ground
yes
35
35
Idle Air Control Value error
yes
56
56
Check Engine Lamp low error
yes
57
57
Check Engine Lamp high error
yes
61
61
Charcoal Canister Purge low error (If applicable)
yes
62
62
CCP Solenoid high error (If applicable)
yes
87
87
AC Clutch relay low error
yes
88
88
AC Clutch relay high error
yes
93
93
Quad Driver Sub Module error
yes
51
51
EPROM error
yes
55
55
EEPROM error
yes
91
91
Tacho out low error
yes
92
92
Tacho out high error
yes
29
29
Fuel Pump relay shorted to ground
yes
32
32
Fuel Pump relay shorted to battery
yes
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст