IK0800130 - Air Pressure Gauges and A/C Pressure Transducer Troubleshooting on Post-... Page 1 of 6

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IK0800130
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Availability: ISIS, Bus ISIS, FleetISIS, NotSIR

Revision: 15

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ELECTRICAL SYSTEM

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Charles
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Title : Air Pressure Gauges and A/C Pressure Transducer Troubleshooting on Post-2007 HPV and ProStar
Applies To : 2007 and later ProStar and NGV

Change Log
Please refer to the change log text box below for recent changes to this article:
11/14/2018 ‐ Formatting corrected, updated screenshots and hyperlinks. Added 1079‐0 and 1079‐1 to the DTC list.
04/17/2018 ‐ Author updated for feedback purposes





Description
The air pressure transducers and the A/C pressure transducer run off of the same 5 volt reference supply from the Body Controller (BC). There
is only one 5 volt source inside the Body Controller and that 5 volt source supplies voltage to three pins: E4, E6 & E8. These pins are all on the
1602(J5) connector of the Body Controller. A short to ground on any of these three outputs will cause all three pins to lose their voltage.
Usually the first thing that people notice when there is a problem with the 5 volt reference circuits is that the air pressure gauges or the A/C
quit working. That does not mean however, that the problem is in those circuits. It could be in any of the three circuits. You need to keep this
in mind when troubleshooting these issues.

Symptoms
Diagnostic Trouble Codes & Dashboard Indicator Lights:
SPN‐FMI Description

BCM
Terminal

Signal

Action

116‐0

Brake Application Pressure Sensor
1600‐B14
Reading Above Normal Range

Service_Brake_App_Air_Sensor_Signal

Open Circuit Between B/C 1600‐
B14 and Air Application
Transducer 1822‐C

116‐1

Brake Application Pressure Sensor
1600‐B14
Reading Below Normal Range

Service_Brake_App_Air_Sensor_Signal

Shorted Circuit Between B/C
1600‐B14 and Air Application
Transducer 1822‐C

1087‐0

Primary Air Tank Sensor Reading
Above Normal Range

1600‐B2

Primary_Air_Sensor_Raw_Signal

Open Circuit Between B/C 1600‐
B2 and Primary Air Pressure
Transducer 1811‐C

1087‐1

Primary Air Tank Sensor Reading
Below Normal Range

1600‐B2

Primary_Air_Sensor_Raw_Signal

Shorted Circuit Between B/C
1600‐B2 and Primary Air Pressure
Transducer 1811‐C

1600‐B3

Secondary_Air_Sensor_Raw_Signal

1088‐0

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Secondary Air Tank Sensor
Reading Above Normal Range

Open Circuit Between B/C 1600‐
B3 and Secondary Air Pressure
Transducer 1812‐C

1088‐1

Secondary Air Tank Sensor
Reading Below Normal Range

1600‐B3

Secondary_Air_Sensor_Raw_Signal

1079‐0

5V Sensor Supply Above Normal
Range

1602‐
E4;E6;E8

Switched_5V_Sense_Raw_Signal

1079‐1

5V Sensor Supply Below Normal
Range

1602‐
E4;E6;E8

Switched_5V_Sense_Raw_Signal

Shorted Circuit Between B/C
1600‐B3 and Secondary Air
Pressure Transducer 1812‐C

Customer Observations or Concerns:
• Air pressure gauges inop
• A/C inop

Special Tools / Software
Tool Description

Tool
Number

Diamond Logic Builder
(DLB)

Comments

Instructions

EZ‐Tech Software

Fluke DVOM

ZTSE4357

Electrical Tester

ZTSE4858

Digital Multimeter

180‐Pin Breakout Box

00‐00956‐08

Breakout box allows for testing engine control module and body control module
systems

Breakout Harness Kit

Multiple

Use breakout harness that is applicable to the system you are testing

Terminal Test Kit

77066‐nav

Hickok Break‐Out Tee Builder And Pin‐Out Tool

Diagnostic Steps
Signals to Watch
Figure 1 ‐ DLB Session Signals

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Troubleshooting
1. Check and record the DTC's using DLB, not the cluster. For info on doing this properly, please follow IK2600036 ‐ Retrieving Fault Codes
with DLB.
2. Check ignition and accessory voltage to the Body Controller. For info on doing this, please follow IK0800092 ‐ The First Check to make
when Troubleshooting any Body Controller or ESC Issue.
3. Make a session in DLB using the features for the Air Pressure Gauges and Brake Application Gauge (if equipped).
◦ For assistance with creating a session in DLB please follow IK2600008 ‐ How to Diagnose Electrical Problems with Diamond Logic®
Builder
◦ The Switched_5V_Sense_Raw_Signal was added manually from Signals → ESC Signals
4. The primary, secondary, air application & Air pressure transducers all use the same 5v reference. So, a problem in one circuit can affect
them all. If more than one Gauge is affected, there may be a problem in the 5v ref. circuit. Connect breakout box, turn the key on and
check the voltage on pin E4 of the 1602(J5) connector at the BC. If you have 0v or close to it, the most likely cause is a short to ground on
the 5v ref. circuit. This could be in any of the three 5v ref circuits out of pins E4, E6 or E8. The air pressure gauge 5v reference circuit is
pictured in green in the diagram below.
5. If you do have 5v in step 3 above then you need to check for 5v with the key on at pin B of the transducer that you are having problems
with. This will tell you if the 5v are reaching the transducer.
Voltage Reading at B/C

B/C Status

PSI Reading

0

2

Out of Range Low

0.092

1

0

1.285

0

140

5.0

2

Out of Range High

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6. Air Pressure Transducer Checks:
a. If you do not have 5v at pin B in step 4 above, check the resistance between pin E4 of the 1602(J5) connector and pin B at the
pressure transducer you are losing with the key off. This is checking the 5 volt ref wire between the BC and the transducer. You
should have 0 ohms or very close to it. If you are reading OL, then you have an open in that circuit.
b. If you have 5v at pin B in step 4 above, check resistance between pin E5 of the 1602(J5) connector and pin A at the air pressure
transducer you are losing with the key off. This is checking the zero volt ref wire between the BC and the transducer. You should
have 0 ohms or very close to it. If you are reading OL, then you have an open in that circuit.
c. Check resistance between pin B2 of the 1600(J3) connector and pin C of the primary air pressure transducer. You should have 0
ohms or very close to it. If you are reading OL, then you have an open in that circuit. This is checking the return wire from the
transducer to the BC.
d. Check resistance between pin B3 of the 1600(J3) connector and pin C of the secondary air pressure transducer. You should have 0
ohms or very close to it. If you are reading OL, then you have an open in that circuit. This is checking the return wire from the
transducer to the BC.
7. A/C Pressure Transducer Checks:
a. If you do not have 5v at pin B in step 4 above, check the resistance between pin E6 of the 1602(J5) connector and pin B at the A/C
pressure transducer with the key off. This is checking the 5 volt ref wire between the BC and the transducer. You should have 0
ohms or very close to it. If you are reading OL, then you have an open in that circuit.
b. If you have 5v at pin B in step 4 above , check resistance between pin E5 of the 1602(J5) connector and pin A at the A/C pressure
transducer with the key off. This is checking the zero volt ref wire between the BC and the transducer. You should have 0 ohms or
very close to it. If you are reading OL, then you have an open in that circuit.
c. Check resistance between pin B12 of the 1600(J3) connector and pin C of the A/C pressure transducer. You should have 0 ohms or
very close to it. If you are reading OL, then you have an open in that circuit. This is checking the return wire from the transducer to
the BC.

Circuit Diagrams
Figure 2 ‐ Circuit Diagram

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•
•
•
•

S08322 Chapter 8, Page 6 Medium Duty Air Pressure Gauge Circuits
S08302 Chapter 8, Page 1 ProStar Air Pressure Gauge Circuits
S08337 Chapter 12, Page 3 Medium Duty A/C Pressure Transducer Circuits
S08302 Chapter 12, Page 1 ProStar A/C Pressure Transducer Circuits
Figure 3 ‐ 1600 Connector View

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Figure 4 ‐ 1602 Connector View

Warranty Information
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.
Standard Repair Time(s):
Refer to the SRT Manual for Repair Times

Other Resources
Master Service Information Site
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