There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about an incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the one shown below in order to
organize all the information for troubleshooting.

STEP

DESCRIPTION

STEP I

Get detailed information about the conditions and the environment when the incident/symptom occurred using the

EC-42, "DIAGNOSTIC WORK SHEET"

STEP II

Before confirming the concern, check and write down (print out using CONSULT-II or GST) the (1st/2nd trip) DTC and
the freeze frame data (When 1st/2nd trip DTC is detected, Freeze Frame Data is not recorded.), then erase the DTC
and the data. (Refer to

EC-34

.) The (1st/2nd trip) DTC and the freeze frame data can be used when duplicating the

incident at STEP III & IV.
If the incident cannot be verified, perform

EC-75, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

Study the relationship between the cause, specified by (1st/2nd trip) DTC, and the symptom described by the cus-
tomer. (The Symptom Matrix Chart will be useful. See

EC-48

Also check related service bulletins for information.

STEP III

Try to confirm the symptom and under what conditions the incident occurs.
The DIAGNOSTIC WORK SHEET and the freeze frame data are useful to verify the incident. Connect CONSULT-II
to the vehicle in “DATA MONITOR (AUTO TRIG)” mode and check real time diagnosis results.
If the incident cannot be verified, perform

EC-75, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

If the malfunction code is detected, skip STEP IV and perform STEP V.

STEP IV

Try to detect the (1st/2nd trip) DTC by driving in (or performing) the DTC Confirmation Procedure. Check and read
the (1st/2nd trip) DTC and freeze frame data by using CONSULT-II or GST.
During the (1st/2nd trip) DTC verification, be sure to connect CONSULT-II to the vehicle in “DATA MONITOR (AUTO
TRIG)” mode and check real time diagnosis results.
If the incident cannot be verified, perform

EC-75, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

In case the DTC Confirmation Procedure is not available, perform the Overall Function Check instead. The (1st/2nd
trip) DTC cannot be displayed by this check, however, this simplified check is an effective alternative.
The NG result of the Overall Function Check is the same as the (1st/2nd trip) DTC detection.

STEP V

Take the appropriate action based on the results of STEP I through IV.
If the malfunction code is indicated, proceed to TROUBLE DIAGNOSIS FOR DTC PXXXX.
If the normal code is indicated, proceed to the BASIC INSPECTION. (Refer to

EC-44

.)Then perform inspections

according to the Symptom Matrix Chart. (Refer to

EC-48

STEP VI

Identify where to begin diagnosis based on the relationship study between symptom and possible causes. Inspect the
system for mechanical binding, loose connectors or wiring damage using (tracing) Harness Layouts.
Gently shake the related connectors, components or wiring harness with CONSULT-II set in “DATA MONITOR
(AUTO TRIG)” mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CONSULT-II.
Refer to

EC-57

EC-72

The Diagnostic Procedure in EC section contains a description based on open circuit inspection. A short circuit
inspection is also required for the circuit check in the Diagnostic Procedure. For details, refer to Circuit Inspection in

GI-24, "How to Perform Efficient Diagnosis for an Electrical Incident"

Repair or replace the malfunction parts.
If malfunctioning part cannot be detected, perform

EC-75, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-

DENT"

STEP VII

Once you have repaired the circuit or replaced a component, you need to run the engine in the same conditions and
circumstances which resulted in the customer's initial complaint.
Perform the DTC Confirmation Procedure and confirm the normal code [DTC No. P0000] is detected. If the incident is
still detected in the final check, perform STEP VI by using a method different from the previous one.
Before returning the vehicle to the customer, be sure to erase the unnecessary (already fixed) (1st/2nd trip) DTC in
ECM. (Refer to

EC-34, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION"

SEF907L

TROUBLE DIAGNOSIS

EC-43

[YD (WITH EURO-OBD)]

Worksheet Sample

DTC Inspection Priority Chart

EBS013JK

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.

NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to

EC-83, "DTC U1000 CAN COMMUNICATION LINE"

MTBL0533

EC-44

[YD (WITH EURO-OBD)]

TROUBLE DIAGNOSIS

Basic Inspection

EBS013JL

Precaution:
Perform Basic Inspection without electrical or mechanical loads applied;

●

Headlamp switch is OFF.

●

On vehicles equipped with daytime light systems, set lighting switch to the 1st position to light
only small lamps.

●

Air conditioner switch is OFF.

●

Rear defogger switch is OFF.

●

Steering wheel is in the straight-ahead position, etc.

Priority

Detected items (DTC)

●

U1000 CAN communication line

●

P0016 Crankshaft position - camshaft position correlation

●

P0101 P0102 P0103 Mass air flow sensor

●

P0112 P0113 Intake air temperature sensor

●

P0117 P0118 Engine coolant temperature sensor

●

P0122 P0123 P0222 P0223 P2135 Accelerator pedal position sensor

●

P0182 P0183 Fuel pump temperature sensor

●

P0192 P0193 Fuel rail pressure sensor

●

P0237 P0238 Turbocharger boost sensor

●

P0335 P0336 Crankshaft position sensor

●

P0340 P0341 Camshaft position sensor

●

P0563 Battery voltage

●

P0605 P0606 ECM

●

P0642 P0643 P0652 P0653 Sensor power supply

●

P1260 - P1267 Fuel injector adjustment resistor

●

P1610 - P1617 NATS

●

P2228 P2229 Barometric pressure sensor

●

P0045 Turbocharger boost control solenoid valve

●

P0089 P0628 P0629 P1272 - P1275 Fuel pump

●

P0200 - P0204 P1268 - P1271 P2146 - P2149 Fuel injector

●

P0380 Glow relay

●

P0404 EGR volume control valve

●

P0686 ECM relay

●

P1212 TCS communication line

●

P0088 P0093 Fuel system

●

P0217 Engine over temperature (OVERHEAT)

●

P0234 Turbocharger system

●

P0501 P0502 P0503 ASCD vehicle speed sensor

●

P0504 ASCD brake switch

●

P0580 P0581 ASCD steering switch

●

P1211 TCS control unit

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