Suzuki GSX-R 1000 Service Manual: DTC “c93” (p1769): steering damper solenoid valve circuit malfunction

Suzuki GSX-R 1000 Service Manual / Engine / Engine general information and diagnosis / Diagnostic information and procedures / DTC “c93” (p1769): steering damper solenoid valve circuit malfunction

Detected condition and possible cause

Detected condition			Possible cause
C93		Steering damper control current does not flow to the solenoid valve. With ig turned on, ecm detects a failure of internal circuit element. Solenoid current does not converge to the target value. Battery voltage is 10 v or below with the engine running.	Steering damper solenoid valve circuit interrupter element shorted. Feedback current convergence failure. Low battery voltage. Ecm malfunction. Steering damper solenoid valve circuit shorted to vcc. Steering damper solenoid valve circuit open. Steering damper solenoid valve circuit shorted.
P1769	H	Steering damper control current is higher than specified value. An abnormal current is detected during the vehicle standstill. Solenoid current is 0.7 A or above.
	L	Steering damper control current is lower than specified value. With ig turned on, ecm detects a discontinuity. An abnormal current is detected during the vehicle standstill.

Wiring diagram

Suzuki GSX-R. Wiring diagram

Troubleshooting

Caution

when using the multi-circuit tester, do not strongly touch the terminal of the ecm coupler with a needle pointed tester probe to prevent terminal damage.

Note

after repairing the trouble, clear the dtc using sds tool. Refer to “use of sds diagnosis reset procedures” .

Step

Action

Yes

Turn the ignition switch off.
Check the steering damper solenoid valve coupler (1) for loose or poor contacts.

If ok, then measure the steering damper solenoid valve resistance.

Disconnect the steering damper solenoid valve coupler.
Measure the steering damper solenoid valve resistance.

Special tool
(a): 09900–25008 (multi
circuit tester set)

Tester knob indication resistance (Ω)

Steering damper solenoid valve resistance approx. 12.5 Ω at 20 °c (68 °f)

Is the resistance ok?

Go to step 2.

Replace the steering damper with a new one.

Turn the ignition switch on.
Measure the voltage between b/bl wire and ground.

Special tool
(a): 09900–25008 (multi
circuit tester set)

Tester knob indication voltage ( )

Steering damper solenoid valve voltage approx. 10 V when battery is fully charged condition ((+) terminal: b/bl – (–) terminal: ground)

Is the voltage ok?

B/bl (w) wire shorted to vcc, or poor “26” connection failure.
B/o (br) wire open or shorted to ground, or poor “25” connection failure.
If wire and connection are ok, intermittent trouble or faulty ecm.
Recheck each terminal and wire harness for open circuit and poor connection.
Replace the ecm with a known good one, and inspect it again.

Low battery voltage or fuse is blown.
B/bl (w) wire open or shorted to ground, or poor “26” connection failure.
If wire and connection are ok, intermittent trouble or faulty ecm.
Recheck each terminal and wire harness for open circuit and poor connection.
Replace the ecm with a known good one, and inspect it again.

Active control inspection

Set up the sds tool. (Refer to sds operation manual for further details.)
Raise the front wheel off the ground.
Turn the ignition switch on.
Click “steering damper solenoid operating control” (1).

Suzuki GSX-R. Active control inspection

Click each button (2) on/off while turning the handlebars left and right.

Suzuki GSX-R. Active control inspection

Note

at this time, if the steering damping resistance changes from light to heavy by switching on/off, the function is normal.

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Specifications

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Other materials:

Starter relay removal and installation
Removal Turn the ignition switch off. Remove the front seat. Refer to “exterior parts removal and installation” in section 9d (page 9d- 6). Disconnect the battery (–) lead wire (1) from the battery. Remove the starter relay cover (2) and disconnect the starter rel ...

Using the testers
Incorrectly connecting the (+) and (.) Probes may cause the inside of the tester to be burned. If the voltage and current are not known, make measurements using the highest range. When measuring the resistance with the multi-circuit tester (1), ∞ will be shown as 10.00 ...

Specifications
Tightening torque specifications Note the specified tightening torque is described in the following. “Handlebar components” “steering components” “steering damper construction” Reference: for the tightening torque of fastener not specified in this section ...