Isuzu N-Series. Manual — part 932
Transmission Control System (Smoother) 7A-183
7
1. Turn OFF the ignition.
Inspect for an intermittent and for poor connections
at the harness connector of the economy mode
switch (pins 3 and 6 of N-20 connector).
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 32
8
1. Turn OFF the ignition.
2. Disconnect the TCM harness connector.
3. Inspect for an intermittent and for a poor
connection on the economy mode switch
signal circuit at the harness connector of the
TCM (pin 13 of B-428 connector).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 34
9
1. Turn OFF the ignition.
2. Disconnect the TCM harness connector (B-
425 connector).
3. Turn ON the ignition, with the engine OFF.
4. Connect a 3-amp fused jumper wire between
the ECONO indicator lamp control circuit of the
TCM harness connector (pin 12 of B-425
connector) and a known good ground.
Does the ECONO indicator lamp illuminate?
—
Go to Step 12
Go to Step 10
10
1. Turn OFF the ignition.
2. Inspect for an intermittent and for a poor
connection at the harness connector of the
instrument panel cluster (IPC) (pin 7 of B-53
connector).
3. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 11
11
1. Test the ECONO indicator lamp control circuit
between the TCM (pin 12 of B-425 connector)
and the IPC (pin 7 of B-53 connector) for an
open circuit or high resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 33
12
1. Turn OFF the ignition.
2. Disconnect the TCM harness connector.
3. Inspect for an intermittent and for a poor
connection on the ECONO indicator lamp
control circuit at the harness connector of the
TCM (pin 12 of B-425 connector).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 34
13
1. Turn ON the ignition switch, with the engine
OFF.
2. Observe the Economy Switch parameter with
the Tech 2.
Does the Economy Switch parameter indicate OFF
when the switch is OFF?
—
Go to Step16
Go to Step 14
Step
Action
Value(s)
Yes
No
7A-184 Transmission Control System (Smoother)
14
1. Turn OFF the ignition.
2. Disconnect the economy mode and 1st gear
start switch harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the Economy Switch parameter with
the Tech 2.
Does the Economy Switch parameter indicate
OFF?
—
Go to Step 32
Go to Step 15
15
1. Test the economy switch circuit between the
TCM (pin 13 of B-428 connector) and the
economy mode switch (pin 6 of N-20
connector) for a short to ground.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 34
16
1. Turn OFF the ignition.
2. Disconnect the IPC B-53 connector harness
connector.
3. Connect a test lamp between the ECONO
indicator lamp control circuit (pin 7 of B-53
connector) and battery voltage.
4. Turn ON the ignition, with the engine OFF.
Does the test lamp continuously illuminate (test
lamp blink then go out normally)?
—
Go to Step 17
Go to Step 33
17
1. Test the ECONO indicator lamp control circuit
between the TCM (pin 12 of B-425 connector)
and the IPC (pin 7 of B-53 connector) for a
short to ground.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 34
18
1. Turn ON the ignition switch, with the engine
OFF.
2. Observe the 1st gear start switch parameter
with the Tech 2.
Does the 1st gear start switch parameter indicate
ON when the switch is ON?
—
Go to Step 19
Go to Step 20
19
Does the 1st START indicator lamp illuminate at
Step 18?
—
Go to Intermittent
Conditions
Go to Step 26
20
1. Turn OFF the ignition switch.
2. Disconnect the economy mode and 1st gear
start switch harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the 1st Gear Start Switch parameter
with the Tech 2 while momentarily jumping 3-
amp fused jumper wire between the economy
switch harness (pin 4 of N-20 connector) and a
known good ground.
Does the Tech 2 indicate ON when the circuit is
jumpered and OFF when the circuit is not
jumpered?
—
Go to Step 21
Go to Step22
21
Observe the 1st Gear Start Switch parameter with
the Tech 2 while momentarily jumping 3-amp fused
jumper wire across the economy switch harness
(pins 1 and 4 of N-20 connector).
Does the Tech 2 indicate ON when the circuit is
jumpered and OFF when the circuit is not
jumpered?
—
Go to Step 24
Go to Step 23
Step
Action
Value(s)
Yes
No
Transmission Control System (Smoother) 7A-185
22
1. Test the 1st gear start switch signal circuit
between the TCM (pin 1 of B-427 connector)
and the 1st gear start switch (pin 4 of N-20
connector) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 25
23
Repair the open circuit or high resistance on the
ground circuit of the 1st gear start switch (pin 1 of N-
20 connector) and the chassis ground (B-1).
Did you complete the repair?
—
Go to Step 35
—
24
1. Turn OFF the ignition.
2. Inspect for an intermittent and for poor
connections at the harness connector of the
1st gear start switch (pins 1 and 4 of N-20
connector).
3. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 32
25
1. Turn OFF the ignition.
2. Disconnect the TCM harness connector.
3. Inspect for an intermittent and for a poor
connection on the 1st gear start switch signal
circuit at the harness connector of the TCM
(pin 1 of B-427 connector).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 34
26
1. Turn OFF the ignition.
2. Inspect for an intermittent and for a poor
connection at the harness connector of the
IPC (pin 6 of B-53 connector).
3. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 27
27
1. Test the 1st START indicator lamp circuit
between the 1st gear start switch (pin 4 of N-
20 connector) and the IPC (pin 6 of B-53
connector) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 33
28
1. Turn ON the ignition switch, with the engine
OFF.
2. Observe the 1st Gear Start Switch parameter
with the Tech 2.
Does the 1st Gear Start Switch parameter indicate
OFF when the switch is OFF?
—
Go to Step 31
Go to Step 29
29
1. Turn OFF the ignition.
2. Disconnect the economy mode and 1st gear
start switch harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the 1st Gear Start Switch parameter
with the Tech 2.
Does the 1st Gear Start Switch parameter indicate
OFF?
—
Go to Step 32
Go to Step 30
Step
Action
Value(s)
Yes
No
7A-186 Transmission Control System (Smoother)
Chart 3 of 4
30
1. Test the 1st gear start switch circuit between
the TCM (pin 1 of B-427 connector) and the 1st
gear start switch (pin 4 of N-20 connector) for
a short to ground.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 34
31
1. Test the 1st START indicator lamp circuit
between the diode (pin 1 of X-32 connector)
and the IPC (pin 6 of B-53 connector) for a
short to ground.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 35
Go to Step 33
32
Replace the economy mode & 1st gear start switch.
Did you complete the replacement?
—
Go to Step 35
—
33
Repair or replace the IPC. Refer to Instrument
Panel Cluster (IPC) Replacement in the Cab and
Chassis Electrical section.
Did you complete the repair or replacement?
—
Go to Step 35
34
Important:
Replacement TCM must be programmed and
learned.
Replace the TCM. Refer to Transmission Control
Module (TCM) Replacement in this section.
Did you complete the replacement?
—
Go to Step 35
—
35
Reconnect all previously disconnected fuse or
harness connector(s).
Is the action complete?
—
Go to Chart 1 of 4
Step 6
—
Step
Action
Value(s)
Yes
No
Step
Action
Value(s)
Yes
No
1
1. Turn ON the ignition switch, with the engine
OFF.
2. Observe the Emergency Switch parameter
with the Tech 2.
Does the Emergency Switch parameter indicate ON
when the switch is ON?
—
Go to Step 2
Go to Step 3
2
Does the transmission warning lamp blink at Step
1?
—
Go to Intermittent
Conditions
Go to Transmission
Warning Lamp
Inoperative
3
1. Turn OFF the ignition.
2. Disconnect the emergency switch harness
connector.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the voltage feed
circuit of the emergency switch harness (pin 1
of N-17 connector) and a known good ground.
Does the test lamp illuminate?
—
Go to Step 4
Go to Step 5
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