2004 ISUZU TF SERIES fuse box

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–1
ENGINE
CONTENTS
4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
ABBREVIATION CHARTS ........................ 6E-9
4JA1-TC .................................................... 6E-10
4JH1-TC .................................................... 6E-11
ECM CIRCUIT DIAGRAM (4JA1-TC) ........ 6E-14
ECM CIRCUIT DIAGRAM (4JA1-TC) ........ 6E-15
ECM CIRCUIT DIAGRAM (4JH1-TC) ........ 6E-16
ECM CIRCUIT DIAGRAM (4JH1-TC) ........ 6E-17
GROUND POINT CHART GENERAL EXPORT
(LHD) (1/4) ............................................... 6E-18
LOCATION ................................................ 6E-34
PARTS LOCATION ................................... 6E-39
CONNECTOR LIST ................................... 6E-40
RELAY AND FUSE .................................... 6E-43
RELAY AND FUSE BOX LOCATION
(LHD & RHD) ........................................... 6E-43
RELAY AND FUSE BOX LOCATION
(LHD & RHD) ........................................... 6E-44
FUSE AND RELAY LOCATION (LHD & RHD) 6E-45
ECM WIRING DIAGRAM (1/7) .................. 6E-46
ECM WIRING DIAGRAM (2/7) .................. 6E-47
ECM WIRING DIAGRAM (3/7) .................. 6E-48
ECM WIRING DIAGRAM (4/7) .................. 6E-49
ECM WIRING DIAGRAM (5/7) .................. 6E-50
ECM WIRING DIAGRAM (6/7) .................. 6E-51
ECM WIRING DIAGRAM (7/7) .................. 6E-52
ECM CONNECTOR PIN ASSIGNMENT &
OUTPUT SIGNAL .................................... 6E-53
GENERAL DESCRIPTION FOR ECM AND
SENSORS ............................................... 6E-64
Engine Control Module (ECM) ................... 6E-64
Pump Control Unit (PSG) & Data Ex change
Between Control Module ......................... 6E-64
Mass Air Flow (MAF) Sensor & Intake Air
Temperature (IAT) Sensor ....................... 6E-65
Throttle Position Sensor (TPS) .................. 6E-66
Crankshaft Position (CKP) Sensor ............ 6E-66
Engine Coolant Temperature (ECT) Sensor 6E-67
Vehicle Speed Sensor (VSS) .................... 6E-67
GENERAL DESCRIPTION FOR EGR
(EXHAUST GAS RE-CIRCULATION) ..... 6E-68
GENERAL DESCRIPTION FOR
INJECTION PUMP .................................. 6E-70Outline ....................................................... 6E-70
Cross-section View .................................... 6E-70
Low Pressure Fuel Circuit .......................... 6E-71
High Pressure Fuel Circuit ......................... 6E-72
Pump Camshaft Speed Sensor ................. 6E-72
High Pressure Solenoid Valve ................... 6E-73
Timing Control Valve (TCV) ....................... 6E-74
ISUZU Strategy Based Diagnostics .............. 6E-76
Overview .................................................... 6E-76
STRATEGY BASED DIAGNOSTICS CHART 6E-76
Diagnostic Thought Process ...................... 6E-77
1. Verify the Complaint .............................. 6E-77
2. Perform Preliminary Checks .................. 6E-77
3. Check Bulletins and Troubleshooting Hints 6E-78
4. Perform Service Manual Diagnostic Checks 6E-78
5a and 5b. Perform Service Manual Diagnostic
Procedures .............................................. 6E-78
5c. Technician Self Diagnoses .................. 6E-78
5d. Intermittent Diagnosis .......................... 6E-79
5e. Vehicle Operates as Designed ............ 6E-80
6. Re-examine the complaint ..................... 6E-81
7. Repair and Verify Fix ............................. 6E-81
GENERAL SERVICE INFORMATION ....... 6E-82
ON-BOARD DIAGNOSTIC (OBD) ............. 6E-82
TECH 2 OPERATING FLOW CART
(START UP) ............................................. 6E-86
TYPICAL SCAN DATA & DEFINITIONS
(ENGINE DATA) ................................... 6E-88
TYPICAL SCAN DATA & DEFINITIONS
(ENGINE DATA) ................................... 6E-90
MISCELLANEOUS TEST .......................... 6E-92
Plotting Snapshot Graph ............................ 6E-93
Plotting Graph Flow Chart (Plotting graph
after obtaining vehicle information) .......... 6E-94
Flow Chart for Snapshot Replay
(Plotting Graph) ....................................... 6E-95
SNAPSHOT DISPLAY WITH TIS2000 ...... 6E-96
ON-BOARD DIAGNOSTIC (OBD) SYSTEM
CHECK .................................................... 6E-105
Circuit Description ...................................... 6E-105
Diagnostic Aids .......................................... 6E-105
Test Description ......................................... 6E-105

6E–10 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
COMPONENT LOCATOR
Engine Component Locator Table
4JA1-TC
3
1
2645
(1) Mass Air Flow (MAF) & Intake Air Temperature
(IAT) Sensor Assembly
(2) Throttle Cable
(3) Air Cleaner Case(4) Battery
(5) Relay & Fuse Box
(6) EGR Cooler

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–11
4JH1-TC
312
6
45
4
(1) Mass Air Flow (MAF) & Intake Air Temperature
(IAT) Sensor Assembly
(2) Throttle Cable
(3) Air Cleaner Case(4) Battery
(5) Relay & Fuse Box
(6) EGR Cooler (Euro3) / EGR Pipe (Ex cept Euro3)

6E–42 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
No. Connector face No. Connector face
H-33
Engine ~ Engine roomX-16
Black DIODE
P-1
Silver Battery (+)X-17
Black DIODE
P-2
Silver Relay & Fuse box
P-5
Silver Battery (-)
P-6
Silver Body earth (Ground)
P-10
Silver Engine ground
X-5
Black Relay ; Glow
X-13
Black Relay ; ECM MAIN
X-14
Black Relay; A/C Compressor
X-15
Black Relay; Thermo

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–43
RELAY AND FUSE
RELAY A ND FUSE BOX LOCATION (LHD & RHD)
LHD
RHD

6E–44 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
RELAY A ND FUSE BOX LOCATION (LHD & RHD)
RELAY & FUSE BOX
RELAY
No .RELAY
(4JA1-TC/4JH1-TC)
X -1 RELAY; TAIL LIGHT
X -2 RELAY; FRT F OG LI GHT
X -3 RELAY; HORN
X -4 RELAY; DIMMER
X -5 RELAY; GLOW
X -6 RELAY; COND, FAN
X -7 RELAY; RR FOG
X -8 RELAY; STARTER
X -9 SHORT CONNECTOR
(with Co oler) (LHD)
RELAY; HAZARD-RH (RHD)
X-10 SHORT CONNECTOR
(with Co oler) (LHD)
RELAY; HAZARD-LH (RHD)
X -11 RELAY; HEATER
X-12 RELAY; HEAD LIGHT
X-13 RELAY; ECM MAIN
X-14 RELAY; A/C COMP
X-15 RELAY; THERMO
FUSE
SLOW BLOW FUSE
NO.FUSE
(4JA1-TC/4JH1-TC)
EB-1 10A ECM
EB-2 10A RR FOG
EB-3 15A FRT FOG
EB-4 —
EB-5 10A ILLUMI & TAIL-RH
EB-6 10A TAIL-LH
EB-7 10A H/LIGHT RH-LOW
EB-8 10A H/LIGHT LH-LOW
EB-9 10A TRA ILER
EB-10 10A AC G (S)
EB-11 10A H/LIGHT RH-HIGH
EB-12 10A H/LIGHT LH-HIGH
EB-13 10A A/C
EB-14 10A 4WD
EB-15 10A HORN
EB-16 10A HAZARD
NO.SLOW BLOW FUSE
4JA1-TC/4JH1-TC
SBF-1 80A MAIN
SBF-2 20A COND, FAN
SBF-3 50A GLOW
SBF-4 30A ECM
SBF-5 40A IG 1
SBF-6 40A ABS-1
SBF-7 30A ABS-2
SBF-8 30A BLOWER
SBF-9 50A IG 2

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–45
FUSE A ND RELAY LOCATION (LHD & RHD)
FUSE
SLOW BLOW FUSE
RELAYNo. Capacity Indication on label No. Capacity Indication on label
1——12 15A CIGER
2 10A ABS 13 15A AUDIO (+B)
3——14 20A DOOR LOCK
4 15A BACK UP 15 10A METER (+B)
5 15A METER 16 10A ROOM
6 10A TURN 17 10A ANTI THEFT
7 15A ELEC.IG 18 15A STOP
8 15A ENGINE 19 15A ACC SOCKET
9 20A FRT WIPER 20 10A STARTER
10 15A EGR 21 10A SRS
11 10A AUDIO
No. Capacity Indication on label
SBF-10 20A RR DEF
SBF-11 30A POWER WINDOW
Connector No. B-7 B-8 B-40
4JA1-TC, 4JH1-TC REAR
DEFOGGERPOWER
WINDOWACC
SOCKET
FUSE BOX

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–53
ECM CONNECTOR PIN ASSIGNMENT & OUTPUT SIGNAL
4JA1-TC ECM CONNECTOR PIN ASSIGNMENT & OUTPUT SIGNA L
View Looking Into ECM Case
Signal or Continuity Tester Position
Pin
No. B/Box
No.Pin Function Wire
ColorKey SW
OffKey SW
OnEngine
IdleEngine
2000rpmECM
Connec-
tionRange (+) (-)
1 1 ECM Gro und BLK Continuity
with
gro und---Discon-
ne ctOhm 1 GND
2 2 ECM Gro und BLK Continuity
with
gro und---Discon-
ne ctOhm 2 GND
3 3 Batte ry Powe r Supply BLU/
REDLess than
1V10-14V Connect DC V 3 GND
25 25 No Conne ctio n - - - - - - - - -
26 26 No Conne ctio n - - - - - - - - -
27 27 Engine Spee d Output
(To Ta cho Me te r)LGN - - Approx.
23Hz by
w a v e fo rm
or approx.
6.3V Approx.
67Hz by
wave form
or approx.
6.8V Co nnect AC V 27 GND
28 28 No Conne ctio n - - - - - - - - -
29 29 No Conne ctio n - - - - - - - - -
30 30 Brake Switch 1 Signal GRN Less than
1VPedal is not stepped on: Less than 1V
Pedal is stepped on: 10-14VCo nnect DC V 30 GND
31 31 Clutch Switch Signal
(MT Only )YEL Less than
1VPedal is not stepped on: 10-14V
Pedal is stepped on: Less than 1VCo nnect DC V 31 GND
32 32 No Conne ctio n - - - - - - - - -
33 33 A/C ON Signa l Re la y GRN/
YELLess than
1VA/C re que st switch is turne d on: 10-
14V
A/C request switch is turned off: Less
than 1VCo nnect DC V 33 GND
34 34 No Conne ctio n - - - - - - - - -
35 35 To Da ta Link Co nnec-
tor No. 6 & Immobi-
lize r Contro l Unit (ICU
B8)YEL--------
36 36 No Conne ctio n - - - - - - - - -
37 37 No Conne ctio n - - - - - - - - -
38 38 Throttle Po sitio n Sen-
so r (TPS) Output Sig-
na lGRN/
ORGLess than
1VLess than 1V Approx.
0.5VCo nnect DC V 38 49
39 39 Key Sw itch Input Sig-
nal Via Engine FuseWHT Less than
1V10-14V Co nnect DC V 39 GND
40 40 No Conne ctio n - - - - - - - - -