Isuzu N-Series. Service manual — part 714
6E-278 Engine Control System (4HK1)
Chart for with Soother but without ABS
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 the Tech 2.
2.
Turn OFF the ignition for 30 seconds.
3.
Monitor the engine control module (ECM)
Diagnostic Trouble Code (DTC) Information
with the Tech 2.
4.
Start the engine.
Does the DTC fail this ignition?
—
Go to Step 3
Go to Diagnostic
Aids
3
Attempt to communicate with the transmission
control module (TCM) via the Transmission Data
table.
Does the Tech 2 communicate with the TCM?
—
Go to Step 4
Go to Diagnostic
System Check –
Transmission
Controls
4
1.
Turn OFF the ignition.
2.
Measure the resistance across the controller
area network (CAN) Low and High circuits by
back probing the resistor 1 (pins 1 and 2 of B-
387 connector) (resistor 1 is located near the
driver’s side dash panel. It is blue connector).
Is the resistance within the specified value (parallel
resistance of the 120
Ω resister 1 and the 120 Ω
resistor 2 should be 60
Ω)?
50 – 70
Ω
Go to Step 11
Go to Step 5
5
Is the resistance less than the specified value at
Step 4?
—
Go to Step 6
Go to Step 9
6
1.
Keep the DMM with connected.
2.
Disconnect the TCM harness connectors.
Is the resistance within the specified value?
50 – 70
Ω
Go to Step 29
Go to Step 7
7
1.
Keep the DMM with connected.
2.
Disconnect the engine control module (ECM)
harness connectors.
Is the resistance within the specified value?
50 – 70
Ω
Go to Step 30
Go to Step 8
8
1.
Keep the DMM with connected.
2.
Disconnect the data recording module (DRM)
harness connector (DRM is located behind the
glove box).
Is the resistance within the specified value?
50 – 70
Ω
Go to Step 28
Go to Step 21
9
1.
Disconnect the resistor 1 harness connector.
2.
Measure the resistance of the resistor 1.
Is the resistance within the specified value?
110 – 130
Ω
Go to Step 10
Go to Step 26
10
1.
Disconnect the resister 2 harness connector
(resistor 2 is located behind the radio and
above the heater unit. It is blue connector).
2.
Measure the resistance of the resistor 2.
Is the resistance within the specified value?
110 – 130
Ω
Go to Step 22
Go to Step 27
Engine Control System (4HK1) 6E-279
11
1.
Disconnect the resistor 1 and resistor 2
harness connector.
2.
Turn ON the ignition, with the engine OFF.
3.
Connect a DMM between the CAN Low circuit
(pin 1 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
4.
Connect a DMM between the CAN High circuit
(pin 2 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
Are both voltage readings within the specified
value?
1.3 – 3.7 volts
Go to Step 12
Go to Step 15
12
1.
Turn OFF the ignition.
2.
Disconnect the ECM harness connectors.
3.
Disconnect the TCM harness connectors.
4.
Turn ON the ignition, with the engine OFF.
5.
Connect a DMM between the CAN Low circuit
(pin 1 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
6.
Connect a DMM between the CAN High circuit
(pin 2 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
Are both voltage readings within the specified
value?
1.3 – 3.7 volts
Go to Step 13
Go to Step 18
13
1.
Turn OFF the ignition.
2.
Reconnect the TCM harness connectors.
3.
Disconnect the DRM harness connectors.
4.
Turn ON the ignition, with the engine OFF.
5.
Connect a DMM between the CAN Low circuit
(pin 1 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
6.
Connect a DMM between the CAN High circuit
(pin 2 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
Are both voltage readings within the specified
value?
1.3 – 3.7 volts
Go to Step 14
Go to Step 19
14
1.
Turn OFF the ignition.
2.
Reconnect the ECM harness connectors.
3.
Disconnect the TCM harness connectors.
4.
Turn ON the ignition, with the engine OFF.
5.
Connect a DMM between the CAN Low circuit
(pin 1 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
6.
Connect a DMM between the CAN High circuit
(pin 2 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
Are both voltage readings within the specified
value?
1.3 – 3.7 volts
Go to Diagnostic
Aids
Go to Step 20
Step
Action
Value(s)
Yes
No
6E-280 Engine Control System (4HK1)
15
1.
Turn OFF the ignition.
2.
Disconnect the ECM harness connectors.
3.
Disconnect the TCM harness connectors.
4.
Disconnect the DRM harness connector.
5.
Turn ON the ignition, with the engine OFF.
6.
Test the CAN Low and CAN High circuits
among the resistor 1, resistor 2, ECM, TCM
and DRM for a short to ground and short to
voltage.
Did you find and correct the condition?
—
Go to Step 31
Go to Step 16
16
1.
Turn OFF the ignition.
2.
Reconnect the ECM harness connectors.
3.
Turn ON the ignition, with the engine OFF.
4.
Connect a DMM between the CAN Low circuit
(pin 1 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
5.
Connect a DMM between the CAN High circuit
(pin 2 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
Are both voltage readings within the specified
value?
1.3 – 3.7 volts
Go to Step 17
Go to Step 30
17
1.
Turn OFF the ignition.
2.
Reconnect the TCM harness connectors.
3.
Turn ON the ignition, with the engine OFF.
4.
Connect a DMM between the CAN Low circuit
(pin 1 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
5.
Connect a DMM between the CAN High circuit
(pin 2 of B-387 connector) and a known good
ground at the resistor 1 harness connector.
Record the voltage reading.
Are both voltage readings within the specified
value?
1.3 – 3.7 volts
Go to Step 28
Go to Step 29
18
1.
Test for an open or high resistance in the CAN
Low or High circuit (which ever voltage
reading did not read between 1.3 – 3.7 volts in
Step 12) between the DRM and joint
connection.
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 31
Go to Step 23
19
1.
Test for an open or high resistance in the CAN
Low or High circuit (which ever voltage
reading did not read between 1.3 – 3.7 volts in
Step 13) between the TCM and joint
connection.
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 31
Go to Step 24
Step
Action
Value(s)
Yes
No
Engine Control System (4HK1) 6E-281
20
1.
Test for an open or high resistance in the CAN
Low or High circuit (which ever voltage
reading did not read between 1.3 – 3.7 volts in
Step 14) between the ECM and joint
connection.
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 31
Go to Step 25
21
Repair the short circuit each other across the CAN
Low and High circuits among the resistor 1, resistor
2, ECM, TCM and DRM.
Did you complete the repair?
—
Go to Step 31
—
22
1.
Repair the open circuit or high resistance on
the CAN Low and High circuits between the
resistor 1 (pins 1 and 2 of B-387 connector)
and the resistor 2 (pins 1 and 2 of B-431
connector).
2.
Inspect for an intermittent, for poor
connections and corrosion on the CAN Low
and High circuits at the harness connector of
the each resistor.
Did you complete the repair?
—
Go to Step 31
—
23
1.
Inspect for an intermittent, for poor
connections and corrosion on the CAN Low
and High circuits at the harness connector of
the DRM (pins 2 and 8 of B-429 connector).
2.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 31
Go to Step 28
24
1.
Inspect for an intermittent, for poor
connections and corrosion on the CAN Low
and High circuits at the harness connector of
the TCM (pins 2 and 3 of B-427 connector).
2.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 31
Go to Step 29
25
1.
Inspect for an intermittent, for poor
connections and corrosion on the CAN Low
and High circuits at the harness connector of
the ECM (pins 18 and 37 of J-191 connector).
2.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 31
Go to Step 30
26
Replace the resistor 1.
Did you complete the replacement?
—
Go to Step 31
—
27
Replace the resistor 2.
Did you complete the replacement?
—
Go to Step 31
—
28
Replace the DRM. Refer to Data Recording Module
(DRM) Replacement.
Did you complete the replacement?
—
Go to Step 31
—
29
Replace the TCM. Refer to Transmission Control
Module (TCM) Replacement in the transmission
section.
Did you complete the replacement?
—
Go to Step 31
—
Step
Action
Value(s)
Yes
No
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст