the sensor leads and ground or voltage. Verify no continuity between the sensor leads
and the other sensors. Check for corroded/damaged wiring or connectors between
the Electronic Control Unit (ECU) and the wheel speed sensor.
of 0.25 VAC sensor output at ~ 0.5 RPS. Verify the condition of sensor head. Verify
the mounting of the exciter ring and condition of the teeth. Verify the proper bearing
end-play. Verify the condition and retention of the clamping sleeve. Verify the sensor
lead routing and clamping. Check for corroded/damaged wiring or connectors between
the ECU and the wheel speed sensor.

5

Wheel End

Verify the mounting of exciter ring and the condition of teeth. Verify the proper bearing
end-play. Verify the condition and retention of the clamping sleeve. Verify the sensor
lead routing and clamping. Check the mechanical function of brake. Check for kinked
or restricted air hoses.

6

Erratic Sensor Signal

Adjust the sensor to contact the exciter ring. Rotate the wheel and verify a minimum
of 0.25 VAC sensor output at ~ 0.5 RPS. Verify the condition of sensor head. Verify
the mounting of the exciter ring and condition of the teeth. Verify the proper bearing
end-play. Verify the condition and retention of the clamping sleeve. Verify the sensor
lead routing and clamping. Check for corroded/damaged wiring or connectors between
the ECU and the wheel speed sensor.

7

Tire Size Calibration

Verify the correct tire size as desired. Verify the proper tire inflation. Verify the correct
number of exciter ring teeth.

10

Configuration Error

The ECU is configured for four sensors, but it has detected the presence of additional
sensors. Verify the sensor wiring and the ECU configuration.

27

Speed Sensor Repair Tests:
1. Take all measurements at the Electronic Control Unit
(ECU) harness connector pins in order to the check wire
harness and sensor. Probe the connector carefully so
that the terminals are not damaged.
2. The wheel speed sensor measurements should read:
Location

Measurement

Sensor

1500 - 2500 Ohms

Sensor to voltage or ground

Open Circuit (no continuity)

Sensor output voltage

>0.25 of VAC sensor output at ~ 0.5 revs/sec.

3. Clear the DTC after the issue is corrected. The sensor
DTC will remain until the power is cycled to the ABS
ECU and vehicle is driven above 15 MPH or the DTC
was cleared using either the diagnostic Blink Code
Switch or a diagnostic tool.

Cab-mount ECU: Looking into
the wire harness connector

X 4

Connector

Pin

Wheel Speed Sensor
Location

X1
18 Way

10

Right Drive Axle (+)

11

Right Drive Axle (-)

5

Left Steer Axle (+)

8

Left Steer Axle (-)

X2
18 Way

X3
15 Way
(if ECU is
configured for
6 sensors)

28

11

Right Steer Axle (+)

14

Right Steer Axle (-)

15

Left Drive Axle (+)

18

Left Drive Axle (-)

11

Left Additional Axle (+)

14

Left Additional Axle (-)

12

Right Additional Axle (+)

15

Right Additional Axle (-)

Troubleshooting Diagnostic Trouble Codes (DTCs): Power Supply
1st. Blink
Code

6

Location

Power Supply

2nd.
Blink
Code

Diagnostic Trouble
Code Description

Repair Information

1

Battery Voltage Too
Low

Measure the battery voltage under load. Check the vehicle battery and associated
components. Check for damaged wiring. Check for damaged or corroded connectors
and connections.

2

Battery Voltage Too
High

Measure the battery voltage under load. Ensure that battery voltage is correct
for the Electronic Control Unit (ECU). Check the vehicle battery and associated
components. Check for damaged wiring. Check for damaged or corroded connectors
and connections.

Power Supply Tests:
1. Take all measurements at the ECU harness
connector.

3. Check for damaged wiring, damaged or corroded
connectors and connections.

2. Place a load (e.g. an 1157 stop lamp) across the
battery or ignition and ground connection, measure
the ignition and battery voltage with the load. Ignition
to Ground should measure between 9 to 17 VDC.
Battery to Ground should also measure between 9 to
17 VDC.

4. Check the condition of the vehicle battery and
associated components, verify that the ground
connection is good and tightened.
5. Check the alternator output for excessive noise.

Cab-mount ECU:
Looking into wire
harness connector
X 4

Connector
X1
18 Way

Pin

Power Supply Test

1

Ground

2

Ignition

16

Battery

29

Troubleshooting Diagnostic Trouble Codes (DTCs):
Pressure Modulator Valves (PMVs)
1st. Blink
Code

7

Left Steer Axle

8

Right Steer Axle

9

Left Drive Axle

10

Right Drive Axle

16

Left Additional Axle

17

Right Additional Axle

20

Trailer PMV

2nd.
Blink
Code

30

Location

Diagnostic Trouble
Code Description

Repair Information

1

Release Solenoid
Shorted to Ground

Verify no continuity between the PMV leads and ground. Verify 4.9 to 5.5 ohms
from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from REL to HLD. Check
for corroded/damaged wiring or connectors between the Electronic Control Unit
(ECU) and PMV.

2

Release Solenoid
Shorted to Voltage

Verify no continuity between the PMV leads and voltage. Verify 4.9 to 5.5 ohms
from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from REL to HLD. Check
for corroded/damaged wiring or connectors between the ECU and PMV.

3

Release Solenoid
Open Circuit

Verify 4.9 to 5.5 ohms from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from
REL to HLD. Check for corroded/damaged wiring or connectors between the
ECU and PMV.

4

Hold Solenoid Shorted
to Ground

Verify no continuity between the PMV leads and ground. Verify 4.9 to 5.5 ohms
from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from REL to HLD. Check
for corroded/damaged wiring or connectors between the ECU and PMV.

5

Hold Solenoid Shorted
to Voltage

Verify no continuity between the PMV leads and voltage. Verify 4.9 to 5.5 ohms
from REL to CMN & HLD CMN, and 9.8 to 11 ohms from REL to HLD. Check for
corroded/damaged wiring or connectors between the ECU and PMV.

6

Hold Solenoid Shorted
to Open Circuit

Verify 4.9 to 5.5 ohms from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from
REL to HLD. Check for corroded/damaged wiring or connectors between the
ECU and PMV.

7

CMN Open Circuit

Verify 4.9 to 5.5 ohms from REL to CMN & HLD to CMN, and 9.8 to 11 ohms from
REL to HLD. Check for corroded/damaged wiring or connectors between the ECU
and PMV. This is potentially a miswired or internal mechanical problem.

8

Configuration Error

A mis-match exists between the ECU configuration and the modulator installation
and wiring. Verify the PMV wiring and installation. Verify the ECU configuration.
Special Note regarding Trailer PMV: Pneumatic issues can result in this DTC being
set. Verify all lines are free from debris or other obstructions, kinks, etc.

Pressure Modulator Valve (PMV) Repair Tests:
1. Take all measurements at the Electronic Control Unit (ECU) harness
connector pins in order to check wire harness and PMV. Probe the
connector carefully so that the terminals are not damaged.
2. The pressure modulator resistance should read:
Location

Measurement

Release to Common

4.9 to 5.5 Ohms

Hold to Common

4.9 to 5.5 Ohms

Release to Hold

9.8 to 11.0 Ohms

Release, Hold, Common to
Voltage or Ground

Open Circuit (no continuity)

When troubleshooting modulator Diagnostic Trouble Codes (DTCs),
check inactive DTCs and the event history for over-voltage or
excessive noise DTCs. If one of these is found, troubleshoot these
DTCs first before the PMV.

Cab-mount ECU: Looking into
the wire harness connector

4

Connector

X2
18 Way

X3
15 Way (if
the ECU is
configured for
6 modulators)
X4
12 Way

Pin
1
2
3
4
6
7
9
10
13
12
16
17
4
6
7
9
10
13
6
9
12

PMV Location
Left Steer Axle Hold
Left Steer Axle Release
Left Steer Axle Common
Right Steer Axle Hold
Right Steer Axle Common
Right Steer Axle Release
Right Drive Axle Common
Right Drive Axle Hold
Right Drive Axle Release
Left Drive Axle Common
Left Drive Axle Hold
Left Drive Axle Release
Left Additional Axle Hold
Left Additional Axle Common
Left Additional Axle Release
Right Additional Axle Common
Right Additional Axle Hold
Right Additional Axle Release
Trailer PMV Hold
Trailer PMV Release
Trailer PMV Common

31

Troubleshooting Diagnostic Trouble Codes (DTCs):
J1939 Serial Communications
1st. Blink
Code
11
2nd.
Blink
Code

J1939

Diagnostic Trouble
Code Description

Repair Information

1

J1939 Serial Link

There is loss of communications between the Bendix ® ESP® EC‑80™ Controller and
other devices connected to the J1939 link. Check for damaged or reversed J1939
wiring. Check for corroded or damaged connectors. Verify the Electronic Control
Unit (ECU) configuration. Check for other devices inhibiting J1939 communications.

2

J1939 Electronic
Retarder Time‑out
or Invalid Signal

Check for damaged or reversed J1939 wiring. Check for corroded or damaged
connectors. Verify the presence of a retarder on the J1939 link. Verify the ECU
configuration. Verify that the retarder is configured to broadcast ERC1. Check for
other devices inhibiting J1939 communications.

3

J1939 Electronic Engine Check for damaged or reversed J1939 wiring. Check for corroded or damaged
connectors. Verify the presence of ECU on the J1939 link. Verify the ECU
Controller 1 Time‑out
configuration. Verify the ECU is configured to broadcast EEC1. Check for other
or Invalid Signal
devices inhibiting J1939 communications.

4

J1939 Electronic Engine Check for damaged or reversed J1939 wiring. Check for corroded or damaged
connectors. Verify the presence of Engine ECU on the J1939 link. Verify the ECU
Controller 2 Time‑out
configuration. Verify that there is an EEC2 broadcast from the address configured
or Invalid Signal
in the ABS ECU. Check for other devices inhibiting J1939 communications.

5

J1939 AIR Message
Time‑out or Invalid
Signal

6

ESP J1939 CAN
Message Time‑out

7

There is loss of communications between the EC‑80 ECU and the transmission
J1939 Transmission
Communication for HSA ECU over the J1939 link. Check for damaged or reversed J1939 wiring. Check
for damaged or corroded connectors. Verify the presence of transmission ECU on
J1939 link. Check for other devices inhibiting J1939 communications.
Time‑out or invalid data Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Check for other devices inhibiting J1939 communications. Verify the
on XBR
ECU configuration. Verify XBR message being broadcast from address 42.

8

32

Location:

Invalid pressure signals received from a vehicle Controller. Verify the proper
operation of brake demand sensors. Check wiring between brake demand sensors
and the vehicle Controller. Verify the proper programming of vehicle Controller.
Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Check for other device inhibiting J1939 communications.
Invalid ESP messages on the J1939 link. Check for damaged or reversed J1939
wiring. Check for damaged or corroded connectors. Verify the presence of engine
and / or retarder on J1939. Verify the proper programming of engine and/or retarder.
Check for other devices inhibiting J1939 communications.

There is loss of communications between the Bendix EC‑80 Controller and the
transmission ECU over the J1939 link. Check for damaged or reversed J1939 wiring.
Check for corroded or damaged connectors. Verify the presence of engine ECU
on the J1939 link. Verify the ECU configuration. Check for other devices inhibiting
J1939 communications.
Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Check for other devices inhibiting J1939 communications. Verify the
ECU configuration. Verify AUX IO broadcast from address configured in EC‑80 ECU.

10

J1939 Electronic
Transmission Controller
1 Time‑out or Invalid
Signal

11

AUXIO CAN message
Time‑out

12

J1939 Hill Start Feature
Switch Signal Not
Available

Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Verify the ECU configuration. Verify EBC1 being broadcast with a valid
SPN 577 parameter. Check for other devices inhibiting J1939 communications.

14

J1939 CAN Message
related to ESP is
incomplete

Check for damaged or reversed J1939 wiring. Check for damaged or corroded
connectors. Check for other devices inhibiting J1939 communications. Verify the
ECU configuration. Verify ESP messages.

2nd.
Blink