Hummer H1 (2006+). Manual — part 243

7-54

Brake System

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6-7

Short circuit
between two sole-
noid valve leads of
left rear outlet sole-
noid valve.

22 and 4, 5, 6,
7, 21, 23, 24

6.0-15.0

Ω

Check electrical resistance of affected valves and
wiring at ECU connector and at modulator assem-
bly plug. Repair or replace wiring as necessary
and replace modulator if short is internal.
Note: Fault code for both affected valves will be
stored in memory.

6-8

Short circuit
between solenoid
valve and RCP relay
1.

11 and 4, 5, 6,
7, 21, 22, 23, 24

55.0-65.0

Ω

Check wiring harness at ECU connector to pump
relay. Repair or replace as necessary.

6-9

Short circuit
between solenoid
valve and RCP relay
2.

12 and 4, 5, 6,
7, 21, 22, 23, 24

55.0-65.0

Ω

Check wiring harness at ECU connector to pump
relay. Repair or replace as necessary.

6-12

Right front wheel
speed signal miss-
ing.

17 and 34

Greater than
0.9 volts AC
at one tire rev-
olution per
second.

Check for damaged tone wheel, incorrect sensor
adjustment, excessive tone wheel runnout (> .041"),
excessive geared hub input bearing play and tire size
mismatch. Repair or replace as necessary.

6-13

Left rear wheel
speed signal miss-
ing.

18 and 35

Greater than
0.9 volts AC
at one tire rev-
olution per
second.

Check for damaged tone wheel, incorrect sensor
adjustment, excessive tone wheel runnout (> .041"),
excessive geared hub input bearing play and tire size
mismatch. Repair or replace as necessary.

6-14

Left front wheel
speed signal miss-
ing.

15 and 32

Greater than
0.9 volts AC
at one tire rev-
olution per
second.

Check for damaged tone wheel, incorrect sensor
adjustment, excessive tone wheel runnout (> .041"),
excessive geared hub input bearing play and tire size
mismatch. Repair or replace as necessary.

6-15

Right rear wheel
speed signal miss-
ing.

16 and 33

Greater than
0.9 volts AC
at one tire rev-
olution per
second.

Check for damaged tone wheel, incorrect sensor
adjustment, excessive tone wheel runnout (> .041"),
excessive geared hub input bearing play and tire size
mismatch. Repair or replace as necessary.

Fault Code List - Ignition key “OFF” to test system (except where noted)

Test pin locations refer to ABS Pinout Box J–35592

Fault Code

Problem Area

Test Pin

Locations

Values

Check/Repair

6-1-05

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Brake System 7-55

5745804

Figure 7-49: ABS/TT4 Main System Diagram.

11-1-05

7-56

Brake System

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Figure 7-50: ABS/TT4 Power, Ground and Warning Lamp Circuit.

6-1-05

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Brake System 7-57

5745804

Figure 7-51: 35 Pin ECU Connector Female Half

PIN

CKT

COLOR

DESCRIPTION

1

990

PK

ABS valve relay input

3

961

PP

TT4 lamp activation

4

977

WH

Right rear inlet valve activation

5

976

RD

Right rear outlet valve activation

6

973

OR

Right front inlet valve activation

7

972

YL

Right front outlet valve activation

8

991

LB

ABS valve relay activation

9

601

PK

Ignition feed

11

605

PP

Positive pump relay activation

12

610

RD

Negative pump relay activation

13

606

OR

Diagnostic line

14

607

TN

Diagnostic line

15

997

BK

Left front wheel speed sensor low

16

995

BK

Right rear wheel speed sensor low

17

999

BK

Right front wheel speed sensor low

18

993

BK

Left rear wheel speed sensor low

19

990

PK

ABS valve relay redundant input

21

975

LB

Left rear inlet valve activation

22

974

DB

Left rear outlet valve activation

23

971

PP

Left front inlet valve activation

24

970

TN

Left front outlet valve activation

25

677

GY

Shuttle valve switch signal

26

603

RD

ABS warning lamp activation

27

570

BK

Ground

30

609

YL

Pump motor monitor

31

978

BK

Reference ground

32

996

BR

Left front wheel speed sensor high

C7 FEMALE ONLY

9-S12-043

D1

D2

D3

D4

D5

D6

D7

D8

D9 D10 D11 D12 D13 D14 D15 D16 D17 D18

D19 D20 D21 D22 D23 D24 D25 D26 D27 D28 D29 D30 D31 D32 D33 D34 D35

6-1-05