Acura CSX. Instruction — page 135

13

*05

15

YES

NO

YES

NO

11-214

PGM-FI System

MRLY (GRN)

ECM/PCM
CONNECTOR A (44P)

MRLY

PGM-FI MAIN RELAY 1 4P CONNECTOR

C

B

PGM-FI MAIN RELAY 1 4P CONNECTOR

69. Check for continuity between PGM-FI main relay 1

4P connector terminal No. 4 and ECM/PCM
connector terminal A6.

Test PGM-FI main relay 1 (see page 22-70). If

the relay is OK, update the ECM/PCM if it does not
have the latest software (see page 11-227), or
substitute a known-good ECM/PCM (see page 11-7),
then recheck. If the symptom/indication goes away
with a known-good ECM/PCM, replace the original
ECM/PCM (see page 11-228).

Repair open in the wire between the ECM/

PCM (A6) and PGM-FI main relay 1.

70. Turn the ignition switch to LOCK (0).

71. Remove PGM-FI main relay 1 (C) from the under-

hood fuse/relay box.

72. Measure the voltage between PGM-FI main relay 1

4P connector terminal No. 1 and body ground.

Go to step 73.

Replace the under-hood fuse/relay box

(see page 22-65).

Terminal side of female terminals

Terminal side of female terminals

Terminal side of female terminals

Is ther e continuity?

Is ther e batter y voltage?

08/08/21 14:23:32 61SNR030_110_0214

16

*06

YES

NO

YES

NO

YES

NO

11-215

IGP

ECM/PCM CONNECTOR A (44P)

IGP (ORN)

PGM-FI MAIN RELAY 1 4P CONNECTOR

ECM/PCM CONNECTORS

B (44P)

PG2 (BLK/RED)

PG1 (BLK)

C (44P)

LG2
(BRN/YEL)

LG1
(BRN/YEL)

PGMETCS
(BLK)

(BLK)*

*: ’07-09 models

73. Check for continuity between PGM-FI main relay 1

4P connector terminal No. 2 and ECM/PCM
connector terminal A8.

Go to step 74.

Repair open in the wire between the ECM/

PCM (A8) and PGM-FI main relay 1.

74. Test PGM-FI main relay 1 (see page 22-70).

Go to step 75.

Replace PGM-FI main relay 1.

75. Disconnect ECM/PCM connector B (44P).

76. Check for continuity between body ground and

ECM/PCM connector terminals B1, B36, C2, C40,
and C44 individually.

Go to step 77.

Repair open in the wire between the ECM/

PCM (B1, B36, C2, C40, C44) and G101; A/T model
(see page 22-16), M/T model (see page 22-18).

Terminal side of female terminals

Terminal side of
female terminals

Terminal side of female terminals

Is ther e continuity?

Is PGM-F I main r elay 1 OK ?

Is ther e continuity?

08/08/21 14:23:33 61SNR030_110_0215

28

18

YES

NO

YES

NO

YES

NO

YES

NO

11-216

PGM-FI System

ECM/PCM CONNECTOR C (44P)

VCC1 (YEL/RED)

ECM/PCM CONNECTOR B (44P)

VCC2 (YEL/BLU)

(YEL)*

* : K20Z3 engine

77. Check for continuity between ECM/PCM connector

terminal C13 and body ground.

Go to step 78.

Go to step 79.

78. Continue to check for continuity between ECM/PCM

connector terminal C13 and body ground, while
disconnecting these connectors, one at a time:

• MAP sensor 3P connector
• Output shaft (countershaft) speed sensor 3P

connector (K20Z2 engine)

Replace the part that caused an open when it

was disconnected.

Repair short in the wire between the ECM/

PCM (C13) and the MAP sensor or the output shaft
(countershaft) speed sensor (K20Z2 engine).

79. Check for continuity between ECM/PCM connector

terminal B18 and body ground.

Go to step 80.

Go to step 81.

80. Continue to check for continuity between ECM/PCM

connector terminal B18 and body ground, while
disconnecting these connectors, one at a time:

• EGR valve 6P connector (K20Z2 engine)
• Input shaft (mainshaft) speed sensor 3P

connector (K20Z2 engine)

• Output shaft (countershaft) speed sensor 3P

connector (K20Z3 engine)

Replace the part that caused an open when it

was disconnected.

Repair short in the wire between the ECM/

PCM (B18) and the EGR valve (K20Z2 engine), the
input shaft (mainshaft) speed sensor (K20Z2
engine) or the output shaft (countershaft) speed
sensor (K20Z3 engine).

Terminal side of female terminals

Terminal side of female terminals

Is ther e continuity?

Does continuity go away when one of the above
components is disconnected?

Is ther e continuity?

Does continuity go away when one of the above
par ts is disconnected?

08/08/21 14:23:33 61SNR030_110_0216

19

31

YES

NO

YES

NO

YES

NO

YES

NO

11-217

ECM/PCM CONNECTOR C (44P)

VCC3 (BLU)

ECM/PCM CONNECTOR A (44P)

VCC4
(BRN)

81. Check for continuity between ECM/PCM connector

terminal C12 and body ground.

Go to step 82.

Go to step 83.

82. Continue to check for continuity between ECM/PCM

connector terminal C12 and body ground, while
disconnecting the throttle body 6P connector.

Repair short in the wire between the ECM/

PCM (C12) and the throttle body.

Replace the throttle body; K20Z2 engine

(see page 11-348), K20Z3 engine (see page 11-349).

83. Check for continuity between ECM/PCM connector

terminal A25 and body ground.

Go to step 84.

Go to step 85.

84. Continue to check for continuity between ECM/PCM

connector terminal A25 and body ground, while
disconnecting the APP sensor 6P connector.

Repair short in the wire between the ECM/

PCM (A25) and the APP sensor.

Replace the accelerator pedal module; K20Z2

engine (see page 11-269), K20Z3 engine (see page
11-270).

Terminal side of female terminals

Terminal side of female terminals

Is ther e continuity?

Is ther e continuity?

Is ther e continuity?

Is ther e continuity?

08/08/21 14:23:34 61SNR030_110_0217

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