Troubleshooting Diagnostic Trouble Codes: Power Supply; Ignition Voltage Too Low; Ignition Voltage Too High; Power Supply Tests - BENDIX Wingman ACB Service Data

TROUBLESHOOTING DIAGNOSTIC TROUBLE
CODES: POWER SUPPLY

IGNITION VOLTAGE TOO LOW

Measure the ignition voltage under load. Ensure that the
ignition voltage is greater than 10 VDC (volts DC). Check
the vehicle battery and associated components. Inspect
for damaged wiring, damaged or corroded connectors and
loose connections. Check condition of the fuse.

IGNITION VOLTAGE TOO HIGH

Measure the ignition voltage. Ensure that ignition voltage
is not greater than 16 VDC. Check the vehicle battery
and associated components. Inspect for damaged wiring,
damaged or corroded connectors and loose connections.

POWER SUPPLY TESTS

1. Take all measurements at the radar sensor harness
connector.
2. Place a load (e.g. 1157 stop lamp) across the supply
voltage and ground connection. Measure the voltage
with the load. The supply voltage on pin 8 to ground
should measure between 10 to 16 VDC (volts DC).
3. Check for damaged wiring, damaged or corroded
connectors and loose connections.
4. Check the condition of vehicle battery and associated
components. Ensure the connection to ground is
secure and tight.
5. Using the procedures described by the vehicle
manufacturer, check the alternator output for excessive
noise.
Pin # Designation
1 GND (-)
2 CAN-H
3 CAN-L
4 NC
5 NC
6 NC
7 NC
8 IGN (+)
Note: View from pin side
TABLE 7 - POWER SUPPLY PIN CODES
Description
Sensor Ground
J1939 High
J1939 Low
No Connection
No Connection
No Connection
No Connection
Supply Voltage
TROUBLESHOOTING DIAGNOSTIC TROUBLE
CODES: J1939 SERIAL COMMUNICATIONS

J1939 SERIAL DATA COMMUNICATIONS LINK

Check for a loss of communications between the Wingman
ACB radar sensor, the ABS controller, the engine ECU,
and other devices connected to the J1939 link. Check for
damaged or reversed J1939 wiring. Check for corroded
or damaged connectors and loose connections. Using
procedures described by the vehicle manufacturer, verify
the presence of the engine ECU and the ABS controller
on the J1939 link.
Verify the engine ECU confi guration. Check for other
devices inhibiting J1939 communications.
J1939 ENGINE COMMUNICATIONS TEST
PROCEDURE
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Bendix Wingman ACB requires several J1939 messages
from the engine ECU to control the engine and retarder
torque for distance control and braking. The ACB system
will set a diagnostic trouble code if one of these messages
is not present.
Use the engine manufacturer's diagnostic test procedures
to verify that there are no errors present in the engine that
may prevent the ACB system from controlling the engine
or retarder torque.

J1939 TROUBLESHOOTING PROCEDURE

1. Take all measurements at the harness connector
unless otherwise indicated.
NOTICE: DO NOT INSERT PROBES INTO THE
BACK SIDE OF THE CONNECTOR AS THIS WILL
DAMAGE THE SEAL AROUND THE WIRE.
NOTICE: DO NOT INSERT ANY PROBE INTO
THE PIN ON THE MATING CONNECTOR OF THE
RADAR SENSOR THAT IS GREATER THAN 0.62 mm
DIAMETER OR SQUARE. THIS WILL DAMAGE THE
CONNECTOR PIN AND REQUIRE REPLACEMENT
OF THE HARNESS.
2. Check for damaged or reversed J1939 wiring.
If the J1939 HIGH or J1939 LOW wiring circuits
are damaged, such as shorting together, the entire
J1939 link will be lost. The failure may be intermittent
enabling the J1939 link to operate normally sometimes.
In that event, multiple diagnostic trouble codes will be
logged in multiple engine and vehicle controllers.
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