Isuzu N-Series. Service manual — part 933
Transmission Control System (Smoother) 7A-187
4
1. Turn ON the ignition, with the engine OFF.
2. Observe the Emergency Switch parameter
with the Tech 2 while momentarily jumping 3-
amp fused jumper wire across the emergency
switch harness connector between pins 1 and
5 of the N-17 connector.
Does the Tech 2 indicate ON when the circuit is
jumpered and OFF when the circuit is not
jumpered?
—
Go to Step 7
Go to Step 6
5
Repair the open circuit or high resistance on the
voltage feed circuit between the Meter (10A) fuse
(F-16) in the glove box fuse block and the
emergency switch (pin 1 of N-17 connector).
Did you complete the repair?
—
Go to Step 36
—
6
1. Test the emergency switch signal circuit
between the TCM (pin 4 of B-428 connector)
and the emergency switch (pin 5 of N-17
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 36
Go to Step 8
7
1. Turn OFF the ignition.
2. Disconnect the emergency switch harness
connector.
3. Inspect for an intermittent and for poor
connections at the harness connector of the
emergency switch (pins 1 and 5 of N-17
connector).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 36
Go to Step 12
8
1. Turn OFF the ignition.
2. Disconnect the TCM harness connector.
3. Inspect for an intermittent and for a poor
connection on the emergency switch circuit at
the harness connector of the TCM (pin 4 of B-
428 connector).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 36
Go to Step 35
9
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
OFF when the switch is OFF?
—
Go to Intermittent
Conditions
Go to Step 10
10
1. Turn OFF the ignition.
2. Disconnect the emergency switch harness
connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the Emergency Switch parameter
with the Tech 2.
Does the Emergency Switch parameter indicate
OFF?
—
Go to Step 12
Go to Step 11
Step
Action
Value(s)
Yes
No
7A-188 Transmission Control System (Smoother)
11
1. Test the emergency switch circuit between the
TCM (pin 4 of B-428 connector) and the
emergency switch (pin 5 of N-17 connector) for
a short to ground.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 36
Go to Step 35
12
Replace emergency switch.
Did you complete the replacement?
—
Go to Step 36
—
13
1. Turn ON the ignition switch, with the engine
OFF.
2. Observe the Emergency 1st Switch parameter
with the Tech 2.
Does the Emergency 1st Switch parameter indicate
ON when the switch is 1?
—
Go to Step 14
Go to Step 16
14
Does the Emergency 1st Switch parameter indicate
OFF when the switch is N?
—
Go to Step 15
Go to Step 19
15
Does the Emergency N Switch parameter indicate
ON when the switch is N?
—
Go to Intermittent
Conditions
Go to Step 21
16
1. Turn OFF the ignition switch.
2. Disconnect the emergency shift switch
harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the Emergency 1st Switch parameter
with the Tech 2 while momentarily jumping 3-
amp fused jumper wire between the
emergency shift switch harness (pin 3 of N-18
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 17
Go to Step 18
17
Observe the Emergency 1st Switch parameter with
the Tech 2 while momentarily jumping 3-amp fused
jumper wire across the emergency shift switch
harness (pins 3 and 5 of N-18 connector).
Does the Tech 2 indicate ON when the circuit is
jumpered and OFF when the circuit is not
jumpered?
—
Go to Step 29
Go to Step 33
18
1. Test the emergency 1st position switch signal
circuit between the TCM (pin 14 of B-428
connector) and the emergency shift switch (pin
3 of N-18 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 36
Go to Step 30
19
1. Turn OFF the ignition.
2. Disconnect the switch harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the Emergency 1st Switch parameter
with the Tech 2.
Does the Emergency 1st Switch parameter indicate
OFF?
—
Go to Step 34
Go to Step 20
Step
Action
Value(s)
Yes
No
Transmission Control System (Smoother) 7A-189
20
1. Test the emergency 1st position switch circuit
between the TCM (pin 14 of B-429 connector)
and the emergency shift switch (pin 3 of N-18
connector) for a short to ground.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 36
Go to Step 35
21
1. Turn OFF the ignition switch.
2. Disconnect the emergency shift switch
harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the Emergency N Switch parameter
with the Tech 2 while momentarily jumping 3-
amp fused jumper wire between the
emergency shift switch harness (pin 2 of N-18
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 22
Go to Step 23
22
Observe the Emergency N Switch parameter with
the Tech 2 while momentarily jumping 3-amp fused
jumper wire across the emergency shift switch
harness (pins 2 and 5 of N-18 connector).
Does the Tech 2 indicate ON when the circuit is
jumpered and OFF when the circuit is not
jumpered?
—
Go to Step 29
Go to Step 33
23
1. Test the emergency N position switch signal
circuit between the TCM (pin 6 of B-428
connector) and the emergency shift switch (pin
2 of N-18 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 36
Go to Step 30
24
1. Turn ON the ignition switch, with the engine
OFF.
2. Observe the Emergency R Switch parameter
with the Tech 2.
Does the Emergency R Switch parameter indicate
ON when the switch is R?
—
Go to Step 25
Go to Step 26
25
Does the Emergency R Switch parameter indicate
OFF when the switch is N?
—
Go to Intermittent
Conditions
Go to Step 31
26
1. Turn OFF the ignition switch.
2. Disconnect the emergency shift switch
harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the Emergency R Switch parameter
with the Tech 2 while momentarily jumping 3-
amp fused jumper wire between the
emergency shift switch harness (pin 1 of N-18
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 27
Go to Step 28
Step
Action
Value(s)
Yes
No
7A-190 Transmission Control System (Smoother)
27
Observe the Emergency R Switch parameter with
the Tech 2 while momentarily jumping 3-amp fused
jumper wire across the emergency shift switch
harness (pins 1 and 5 of N-18 connector).
Does the Tech 2 indicate ON when the circuit is
jumpered and OFF when the circuit is not
jumpered?
—
Go to Step 29
Go to Step 33
28
1. Test the emergency R position switch signal
circuit between the TCM (pin 20 of B-428
connector) and the emergency shift switch (pin
1 of N-18 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 36
Go to Step 30
29
1. Turn OFF the ignition.
Inspect for an intermittent and for poor connections
at the harness connector of the emergency shift
switch (pins 1, 2, 3 and 5 of N-18 connector).
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 36
Go to Step 34
30
1. Turn OFF the ignition.
2. Disconnect the TCM harness connector.
3. Inspect for an intermittent and for poor
connections on the emergency shift switch
signal circuit at the harness connector of the
TCM (pin 6, 14 and 20 of B-428 connector).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 36
Go to Step 35
31
1. Turn OFF the ignition.
2. Disconnect the switch harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the Emergency R Switch parameter
with the Tech 2.
Does the Emergency R Switch parameter indicate
OFF?
—
Go to Step 34
Go to Step 32
32
1. Test the emergency R position switch circuit
between the TCM (pin 20 of B-428 connector)
and the emergency shift switch (pin 1 of N-18
connector) for a short to ground.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 36
Go to Step 35
33
Repair the open circuit or high resistance on the
ground circuit of the emergency shift switch (pin 5 of
N-18 connector) and the chassis ground (B-1).
Did you complete the repair?
Go to Step 36
—
34
Replace emergency shift switch.
Did you complete the replacement?
—
Go to Step 36
—
35
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 36
—
Step
Action
Value(s)
Yes
No
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