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? U0001:88 U0073:00 U0073	Yes	Verify the malfunctioning part referring to "DETERMINING MALFUNCTIONING PART (HS-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. Inspect the DTC using the M-MDS. Is DTC U0001:88, U0073:00, or U0073 displayed?	Yes	Go to Step 4.
2		No	Go to the next step.
3	VERIFY MODULE IN WHICH DTC DISPLAYED Is DTC U0001:88, U0073:00, or U0073 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 HS-CAN LINE RESISTANCE Disconnect the negative battery cable. Verify the resistance between DLC-2 terminals E and F. Is the resistance 59-65 ohms?	Yes	Go to the next step.
4		No	Go to Step 6.
5	INSPECT HS-CAN LINE FOR SHORT TO GROUND Verify continuity between the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E 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 HS-CAN line can be considered the cause. (See DETERMINING SHORT TO GROUND LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)
5		No	Go to Step 7.
6	INSPECT HS-CAN LINE FOR OPEN CIRCUIT OR SHORT BETWEEN CIRCUITS Verify the resistance between DLC-2 terminals E and F. Is the resistance 118-130 ohms?	Yes	Go to Step 8.
6		No	Go to Step 9.
7	INSPECT HS-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 E and F. 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 HS-CAN line can be considered the cause. (See DETERMINING OPEN CIRCUIT LOCATION (HS-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 HS-CAN line can be considered the cause. (See DETERMINING SHORT TO POWER SUPPLY LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)
8	INSPECT PCM AND INSTRUMENT CLUSTER RESISTANCES Disconnect the PCM and instrument cluster connectors. Measure the resistance between PCM connector terminals 1AM-1AI (part side). Measure the resistance between the instrument cluster connector terminals B-D (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 HS-CAN line can be considered the cause. (See DETERMINING OPEN CIRCUIT LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)
8		No	PCM resistance has malfunction Replace the PCM because an open circuit in the PCM can be considered the cause. (See PCM REMOVAL/INSTALLATION [MZR 2.5] .) 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 .)
9	INSPECT HS-CAN LINE FOR OPEN CIRCUIT OR SHORT BETWEEN CIRCUITS Verify the continuity between DLC-2 terminals F and E. 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 HS-CAN line can be considered the cause. (See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (HS-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 HS-CAN line can be considered the cause. (See DETERMINING OPEN CIRCUIT LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .)