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Honda Ridgeline. Manual - part 15

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4-17

Circuit Diagram

IGPLS6

IGPLS5

IGPLS4

IGPLS3

IGPLS2

IGPLS1

MRLY

X32

No.2 (15 A)

UNDER DASH FUSE/RELAY BOX

BLK/YEL

G102

IGPLS1

IGPLS2

IGPLS3

IGPLS4

IGPLS5

IGPLS6

YEL/GRN

BLU/RED

B26

BLK/WHT

BLK

No.1

ICM

WHT/BLU

B27

BLK/WHT

BLK

No.2

ICM

BRN

B20

BLK/WHT

BLK

No.3

ICM

BLK/RED

B21

BLK/WHT

BLK

No.4

ICM

No.5

GRN/WHT

ICM : Ignition Conotrol Module

BLK

BLK/WHT

5 V

PCM

B11

B10

BLK/WHT

No.17 (40 A)

RED/YEL

No.6

ICM

BRN/WHT

BATTERY

G101

IGNITION
COIL RELAY

SPARK
PLUGS

IGINITION
COILS

UNDER HOOD
FUSE/RELAY BOX

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Ignition Timing
10 °

2 ° BTDC (RED mark (B)) at idle in Park or

Neutral

4-18

Ignition System

Ignition Timing Inspection

1. Connect the Honda Diagnostic System (HDS) to the

data link connector (DLC) (see step 2 on page 11-3).

2. Start the engine. Hold the engine speed at 3,000

rpm with no load (in Park or Neutral) until the
radiator fan comes on, then let it idle.

3. Check the idle speed (see page 11-272).

4. Jump the SCS line with the HDS.

5. Connect the timing light to the No. 1 ignition coil

harness.

6. Aim the light toward the pointer (A) on the timing

belt cover. Check the ignition timing under a no
load condition (headlights, blower fan, rear window
defogger, and air conditioner are turned off).

7. If the ignition timing differs from the specification,

check the cam timing. If the cam timing is OK,
update the powertrain control module (PCM). If it
does not have the latest software (see page 11-7),
or substitute a known-good PCM (see page 11-8),
then recheck. If the system works properly, and the
PCM was substituted, replace the original PCM
(see page 11-205).

8. Disconnect the HDS and the timing light.

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4-19

Ignition Coil Removal/Installation

6 x 1.0 mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)

6 x 1.0 mm
12 N·m (1.2 kgf·m, 8.7 lbf·ft)

1. Remove the engine cover.

2. Disconnect the ignition coil connectors (A), then

remove the front bank ignition coils (B).

3. Disconnect the ignition coil connectors (A), then

remove the rear bank ignition coils (B).

4. Install the ignition coils in the reverse order of

removal.

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YES

4-20

Ignition System

Ignition Coil Relay Circuit Troubleshooting

IGNITION COIL RELAY 4P SOCKET

No.1 IGNITION COIL 3P CONNECTOR

1. Check the No. 2 (15 A) fuse in the under-dash fuse/

relay box.

Go to step 2.

Replace the fuse . If the fuse continues to

blow, locate and repair the short in the circuit
between the subfuse box and the ignition coils.

2. Remove the ignition coil relay from the under-dash

fuse/relay box, and test it (see page 22-75).

Go to step 3.

Replace the ignition coil relay.

3. Measure the voltage between ignition coil relay 4P

socket terminal No. 1 and body ground, then
terminal No. 4 and body ground.

Go to step 4.

Replace the under-dash fuse/relay box.

4. Check for continuity between ignition coil relay 4P

socket terminal No. 2 and the No. 1 ignition coil 3P
connector terminal No. 3.

Go to step 5.

Repair open in the wire between ignition coil

relay 4P socket terminal No. 2 and No. 1 ignition
coil 3P connector terminal No. 3.

5. Connect the Honda Diagnostic System (HDS) to the

data link connector (DLC) (see step 2 on page 11-3).

6. Turn the ignition switch OFF.

7. Jump the SCS line with the HDS.

NOTE: This step must be done to protect the
powertrain control module (PCM) from damage.

8. Disconnect PCM connector A (44P).

Terminal side of female terminals

Terminal side of
female terminals

Wire side of
female terminals

Is the f use OK ?

Is the r elay OK ?

Is ther e batter y voltage?

Is ther e continuity?

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