Isuzu N-Series. Manual — part 928
Transmission Control System (Smoother) 7A-167
21
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 34
Go to Step 37
22
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
16) between the DRM and joint connection.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 38
Go to Step 28
23
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
15) between the TCM and joint connection.
2. Repair the circuit(s) as necessary.
3. Did you find and correct the condition?
—
Go to Step 38
Go to Step 29
24
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
17) between the ECM and joint connection.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 38
Go to Step 31
25
Repair the short circuit each other across the CAN
Low and High circuits among the resistor 1, TCM
and EHCU.
Did you complete the repair?
—
Go to Step 38
—
26
Repair the short circuit each other across the CAN
Low and High circuits among the resistor 2, ECM,
DRM and EHCU.
Did you complete the repair?
—
Go to Step 38
—
27
1. Test the CAN Low and High circuits between
the resistor 1 (pins 1 and 2 of B-387 connector)
and the EHCU (pins 14 and 15 of J-177
connector) for an open circuit or high
resistance.
2. Test the CAN Low and High circuits between
the resistor 2 (pins 1 and 2 of B-431 connector)
and the EHCU (pins 26 and 27 of J-177
connector) for an open circuit or high
resistance.
3. Inspect for an intermittent, for poor
connections and corrosion on the CAN Low
and High circuits at the harness connector of
the each resistor.
4. Repair the circuit(s) or connection(s) as
necessary.
Did you find and correct the condition?
—
Go to Step 38
Go to Step 30
Step
Action
Value(s)
Yes
No
7A-168 Transmission Control System (Smoother)
28
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 38
Go to Step 34
29
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 38
Go to Step 35
30
1. Inspect for an intermittent, for poor
connections and corrosion on the CAN Low
and High circuits at the harness connector of
the EHCU (pins 14, 15, 26 and 27 of J-177
connector).
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 38
Go to Step 36
31
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 38
Go to Step 37
32
Replace the resistor 1.
Did you complete the replacement?
—
Go to Step 38
—
33
Replace the resistor 2.
Did you complete the replacement?
—
Go to Step 38
—
34
Replace the DRM. Refer to Data Recording Module
(DRM) Replacement.
Did you complete the replacement?
—
Go to Step 38
—
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 38
—
36
Replace the EHCU. Refer to Electric Hydraulic
Control Unit (EHCU Replacement in the Anti-lock
Brake section.
Did you complete the replacement?
—
Go to Step 38
—
37
Important:
Replacement ECM must be programmed.
Replace the ECM. Refer to Engine Control Module
(ECM) Replacement /Restore Fuel Injector ID Code
Data in engine control section.
Did you complete the replacement?
—
Go to Step 38
—
Step
Action
Value(s)
Yes
No
Transmission Control System (Smoother) 7A-169
38
1. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with the Tech 2.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
Did the DTC fail this ignition?
—
Go to Step 3
Go to Step 39
39
Observe the DTC Information with the Tech 2.
Are there any DTCs that you have not diagnosed?
—
Go to Diagnostic
Trouble Code (DTC)
List
System OK
Step
Action
Value(s)
Yes
No
7A-170 Transmission Control System (Smoother)
U0400 (Flash Code 23)
Circuit Description
The engine speed signal to the transmission control
module (TCM) is sent from the engine control module
(ECM) via a controller area network (CAN)
communication bus based on inputs from the crankshaft
position (CKP) sensor and camshaft position (CMP)
sensor. If the TCM detects no engine speed signal from
the ECM during the engine running, this DTC will set.
Condition for Running the DTC
• The ignition switch is ON.
• The ignition voltage is more than 20 volts.
• The emergency switch is OFF.
Condition for Setting the DTC
• The TCM detects that the engine speed CAN Bus
messages from the ECM are not being received.
Action Taken When the DTC Sets
• The TCM illuminates the transmission warning
lamp when the diagnostic runs and fails.
• The TCM inhibits gear select & shift position
learning and half-clutch learning.
Condition for Clearing the DTC
• The TCM turns OFF the transmission warning
lamp when the diagnostic runs and does not fail.
• A current DTC clears when the diagnostic runs and
does not fail.
• A history DTC clears when the diagnostic runs and
does not fail.
Diagnostic Aids
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.
Notice:
• If this DTC is present, the Engine Speed parameter
on the Tech 2 will indicate the turbine speed when
the current gear is neutral or lock up clutch is
engaged. Other condition, it indicates a default
value.
DTC U0400 (Flash Code 23)
Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or Transmission Control
Module (TCM) Connector End Views
Step
Action
Value(s)
Yes
No
1
Did you perform the Diagnostic System Check -
Transmission Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Transmission
Controls
2
1. Install the Tech 2.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Monitor the Diagnostic Trouble Code (DTC)
Information with the Tech 2.
Is DTC U0100 or U0121 set?
—
Go to Applicable
DTC
Go to Step 3
3
1. Select the “4HK1” in the system selection
menu.
2. Monitor the DTC Information with the Tech 2.
Is the engine control module (ECM) DTC P0335,
P0336, P0340, P0341 or P1345 set?
—
Go to Applicable
DTC in Engine
Control Section
Go to Diagnostic
Aids
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