Diagnostic Procedure

CAUTION:

When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
When inspecting the DLC-2, touch it with a paper clip or similar thin pin without directly inserting a tester into the terminals.

Step	Inspection		Action
1	VERIFICATION BEFORE SERVICING Are any DTCs, except the following, displayed? U0010:88 U001088 U0498:68 16:Er12 26:Er81	Yes	Verify the malfunctioning part referring to "DETERMINING MALFUNCTIONING PART (MS-CAN)". (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM] .)
1		No	Store the currently displayed DTC. Attempt to drive the vehicle based on the repair order form, then go to the next step.
2	RE-PERFORM DTC INSPECTION Clear the DTC using the M-MDS. Perform the DTC inspection using the M-MDS and the input/output check mode. Is DTC U0010:88, U001088, U0498:68, 16:Er12, or 26Er81 displayed?	Yes	Go to Step 4.
2		No	Go to the next step.
3	VERIFY MODULE IN WHICH DTC DISPLAYED Is DTC U0010:88, U001088, U0498:68, 16:Er12, or 26:Er81 displayed for 2 or more units?	Yes	Perform the procedure for "Action for Non-repeatable Malfunctions" because there is the possibility of a temporary short to the power supply or ground in the CAN-related wiring harness. (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM] .)
3		No	Explain to the customer that the module which displayed the DTC had a temporary malfunction.
4	INSPECT MS-CAN LINE RESISTANCE Disconnect the negative battery cable. Measure the resistance between the DTC-2 terminals L and K. Is the resistance 59-65 ohms?	Yes	Go to the next step.
4		No	Go to Step 6.
5	INSPECT MS-CAN LINE FOR SHORT TO GROUND Verify continuity between the following terminals: Between DLC-2 terminal L and body ground Between DLC-2 terminal K and body ground Is there continuity?	Yes	Determine the location of the short to ground referring to "Determining Short to Ground Location" because a short to ground in the MS-CAN line can be considered the cause. (See DETERMINING SHORT TO GROUND LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)
5		No	Go to Step 7.
6	INSPECT MS-CAN LINE FOR OPEN CIRCUIT OR SHORT BETWEEN CIRCUITS Measure the resistance between the DLC-2 terminals L and K. Is the resistance 118-130 ohms?	Yes	Go to Step 8.
6		No	Go to Step 9.
7	INSPECT MS-CAN LINE FOR OPEN OR SHORT CIRCUIT TO POWER SUPPLY Connect the negative battery cable. Switch the ignition ON. Measure the voltage at DLC-2 terminals L and K. Is the voltage between 1.5-3.5 V?	Yes	Determine the location of the open circuit referring to "Determining Open Circuit Location" because an open circuit in the MS-CAN line can be considered the cause. (See DETERMINING OPEN CIRCUIT LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)
7		No	Determine the location of the short circuit to the power supply referring to "Determining Short Circuit Location" because a short to ground in the MS-CAN line can be considered the cause. (See DETERMINING SHORT TO POWER SUPPLY LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)
8	INSPECT INSTRUMENT CLUSTER AND INFORMATION DISPLAY RESISTANCES Disconnect the negative battery cable. Disconnect the instrument cluster and information display connectors. Measure the resistance between the instrument cluster connector terminals C-E (part side). Measure the resistance between the information display connector terminals J-L (part side). Is the resistance 118-130 ohms?	Yes	Determine the location of the open circuit referring to "Determining Open Circuit Location" because an open circuit in the MS-CAN line can be considered the cause. (See DETERMINING OPEN CIRCUIT LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)
8		No	Instrument cluster resistance has malfunction Replace the instrument cluster because an open circuit in the instrument cluster can be considered the cause. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) Information display resistance has malfunction Replace the information display because an open circuit in the information display can be considered the cause. (See INFORMATION DISPLAY REMOVAL/INSTALLATION .)
9	INSPECT MS-CAN LINE FOR OPEN CIRCUIT OR SHORT BETWEEN CIRCUITS Verify the continuity between DLC-2 terminals L and K. Is there continuity?	Yes	Determine the location of the short between circuits referring to "Determining Location of Short between Circuits" because a short between circuits in the MS-CAN line can be considered the cause. (See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)
9		No	Determine the location of the open circuit referring to "Determining Open Circuit Location" because an open circuit in the MS-CAN line can be considered the cause. (See DETERMINING OPEN CIRCUIT LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)