Home/Toyota/Highlander/Toyota Highlander III (2013-2016)/Repair manual/Engine Control Systems/Hybrid Control System (Diagnostics - Introduction) (Hybrid)…
Contents Wiring diagrams Section: Engine Control Systems All sections

Hybrid Control System (Diagnostics - Introduction) (Hybrid): Other Toyota Highlander III

Engine Control Systems 10 illustrations ~709 words

DEFINITION OF TERMS [02/2014 - ]

TermDefinition
Monitor DescriptionDescription of what the power management control ECU monitors and how to detects malfunctions (monitoring purpose and its details).
Related DTCsA group of diagnostic trouble codes that are output by the power management control ECU based on the same malfunction detection logic.
Typical Enabling ConditionsPreconditions that allow the power management control ECU to detect malfunctions. With all preconditions satisfied, the power management control ECU stores DTCs when the monitored value(s) exceeds malfunction threshold(s).
Sequence of OperationOrder of monitor priority, applied if multiple sensors and components are involved in a single malfunction detection process. Each sensor and component are monitored in turn and subsequent items are not monitored until the previous detection operation completes.
Required Sensors/ComponentsSensors and components used by the power management control ECU to detect each malfunction.
Frequency of OperationNumber of times the power management control ECU checks for each malfunction during each driving cycle. "Once per driving cycle" means that the power management control ECU only checks for malfunctions once during a single driving cycle. "Continuous" means that the power management control ECU checks for malfunctions whenever enabling conditions are met.
DurationMinimum time for which the power management control ECU must detect continuous deviation in monitored value(s) in order to store a DTC. Timing begins when typical enabling conditions are met.
Malfunction ThresholdsValue beyond which the power management control ECU determines malfunctions exist and stores DTCs.
MIL OperationTiming of MIL illumination after a malfunction is detected. "Immediate" means that the power management control ECU illuminates the MIL as soon as a malfunction is detected. "2 driving cycles" means that the power management control ECU illuminates the MIL if the same malfunction is detected again during the next driving cycle.

Scheme 153

Scheme 153: ILLUSTRATION
*1COMBINATION METER ASSEMBLY*2POWER MANAGEMENT CONTROL ECU
*3INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU-ACC FUSE - BKUP LP FUSE - IG2 FUSE - AM2 FUSE*4DLC3
*5ACCELERATOR PEDAL SENSOR ASSEMBLY*6AIRBAG SENSOR ASSEMBLY
*7AIR CONDITIONING AMPLIFIER ASSEMBLY*8ECO MODE SWITCH
*9EV MODE SWITCH (PATTERN SELECT SWITCH ASSEMBLY)*10SHIFTING HOLE BEZEL

Scheme 154

Scheme 154: ILLUSTRATION
*1THERMISTOR ASSEMBLY*2AUXILIARY BATTERY
*3INVERTER WITH CONVERTER ASSEMBLY*4ECM
*5COMPRESSOR WITH MOTOR ASSEMBLY*6INVERTER WATER PUMP ASSEMBLY
*7HYBRID VEHICLE TRANSAXLE ASSEMBLY*8OIL PUMP WITH MOTOR ASSEMBLY
*9REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY*10HV BATTERY
*11NO. 6 FLOOR WIRE

Scheme 155

Scheme 155: ILLUSTRATION
*1NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY*2NO. 3 ENGINE ROOM RELAY BLOCK
*3PM-IGCT FUSE*4PCU FUSE
*5IGCT RELAY*6INV W/PMP FUSE
*7IGCT NO. 2 FUSE*8SHIFT SW FUSE
*9IGCT NO. 3 FUSE*10BATT FAN RELAY
*11OIL PMP RELAY*12STOP FUSE
*13FUSIBLE LINK BLOCK ASSEMBLY - DC/DC FUSE - RB NO. 3 FUSE - J/B-B FUSE*14BATT FAN FUSE
*15A/C W/PMP FUSE*16OIL PMP FUSE

Scheme 156

Scheme 156: ILLUSTRATION
*1INVERTER WITH CONVERTER ASSEMBLY*2LOW VOLTAGE CONNECTOR
*3AMD TERMINAL*4INVERTER TERMINAL COVER
*5NO. 6 FLOOR WIRE (REAR MOTOR CABLE) CONNECTION*6GENERATOR CABLE CONNECTION
*7HIGH VOLTAGE INPUT*8MOTOR CABLE CONNECTION

Scheme 157

Scheme 157: ILLUSTRATION
*1GENERATOR CABLE*2MOTOR CABLE
*3GENERATOR RESOLVER*4MOTOR TEMPERATURE SENSOR
*5SHIFT LEVER POSITION SENSOR*6MOTOR RESOLVER
*7HYBRID VEHICLE MOTOR ASSEMBLY*8HYBRID VEHICLE GENERATOR ASSEMBLY
*9REAR MOTOR RESOLVER*10REAR MOTOR TEMPERATURE SENSOR
*11EXTENSION WIRE ASSEMBLY*12REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY

Scheme 158

Scheme 158: ILLUSTRATION
*1HYBRID BATTERY JUNCTION BLOCK ASSEMBLY*2SMRB
*3SMRG*4SYSTEM MAIN RESISTOR
*5SMRP*6BATTERY VOLTAGE SENSOR
*7SERVICE PLUG GRIP*8BATTERY COOLING BLOWER ASSEMBLY

Scheme 159

Scheme 159: SYSTEM DIAGRAM [02/2014 - ]

Scheme 160

Scheme 160

Scheme 161

Scheme 161

Scheme 162

Scheme 162

CAUTION / NOTICE / HINT

HINT

  1. *: Use the Techstream
  2. Use the following procedure to troubleshoot the hybrid control system.

PROCEDURE

  1. VEHICLE BROUGHT TO WORKSHOP Result Proceed to NEXT Result: 1 NEXT See step 2
  2. CUSTOMER PROBLEM ANALYSIS Result Proceed to NEXT Result: 1 NEXT See step 3
  3. CONNECT TECHSTREAM TO THE DLC3* HINT: If the display on the tester indicates a communication error, inspect the DLC3. Result Proceed to NEXT Result: 1 NEXT See step 4
  4. CHECK DTC AND FREEZE FRAME DATA* Refer to «DTC CHECK / CLEAR [02/2014 - ]»(ref-644289-S10639471092014072300000) HINT: Make sure to save freeze frame data because the data is necessary for performing simulation tests. For the hybrid control system, there are many DTCs, many of which can be stored due to a single malfunction. As a result, in some of the diagnosis procedures an instruction is provided to check for other DTCs and their corresponding INF codes. By following the diagnosis path based on the combination of output DTCs and INF codes, it is possible to narrow down the problem early and avoid unnecessary diagnosis. Result Proceed to NEXT Result: 1 NEXT See step 5
  5. CLEAR DTC AND FREEZE FRAME DATA* Refer to «DTC CHECK / CLEAR [02/2014 - ]»(ref-644289-S10639471092014072300000) Result Proceed to NEXT Result: 1 NEXT See step 6
  6. CONDUCT VISUAL INSPECTION Result Proceed to NEXT Result: 1 NEXT See step 7
  7. CONFIRM PROBLEM SYMPTOMS HINT: If the engine does not start, perform steps 9 and 11 first. Result Proceed to Malfunction does not occur. Malfunction occurs. Result: 2 Malfunction occurs. See step 10 Result: 1 Malfunction does not occur. See step 8
  8. DUPLICATE CONDITIONS THAT PRODUCE SYMPTOMS Result Proceed to NEXT Result: 1 NEXT See step 9
  9. CHECK FOR DTCS* Refer to «DTC CHECK / CLEAR [02/2014 - ]»(ref-644289-S10639471092014072300000) Result Proceed to DTCs are output. DTCs are not output. Result: 2 DTCs are not output. See step 16 Result: 1 DTCs are output. See step 10
  10. REFER TO DTC CHART HINT: DTCs for the hybrid control system and hybrid battery system are displayed using the same menus on the Techstream. It is necessary to check the DTC charts for hybrid control system and hybrid battery system. Hybrid Control System - DTC chart Refer to «DIAGNOSTIC TROUBLE CODE CHART [02/2014 - ]»(ref-644289-S06149431912014072300000) Hybrid Battery System - DTC chart Refer to «DIAGNOSTIC TROUBLE CODE CHART [02/2014 - ]»(ref-644305-S06759409622014072300000) Result Proceed to NEXT Result: 1 NEXT See step 11
  11. CONDUCT CIRCUIT INSPECTION Result Proceed to Malfunction not confirmed. Malfunction confirmed. Result: 3 Malfunction confirmed. See step 13 Result: 1 Malfunction not confirmed. See step 12
  12. CHECK FOR INTERMITTENT PROBLEMS Refer to «CHECK FOR INTERMITTENT PROBLEMS [02/2014 - ]»(ref-644289-S20908109292014072300000) Result Proceed to NEXT Result: 1 NEXT See step 13
  13. IDENTIFY PROBLEM Result Proceed to NEXT Result: 1 NEXT See step 14
  14. ADJUST AND/OR REPAIR Result Proceed to NEXT Result: 1 NEXT See step 15
  15. CONDUCT CONFIRMATION TEST Result Proceed to NEXT Result: 1 NEXT END
  16. CONDUCT BASIC INSPECTION Result Proceed to Malfunctioning parts not confirmed. Malfunctioning parts confirmed. Result: 2 Malfunctioning parts confirmed. See step 18 Result: 1 Malfunctioning parts not confirmed. See step 17
  17. CHECK ECU POWER SOURCE CIRCUIT Result Proceed to NEXT Result: 1 NEXT See step 11
  18. CONDUCT PARTS INSPECTION Result Proceed to NEXT Result: 1 NEXT See step 13

CHECK FOR INTERMITTENT PROBLEMS [02/2014 - ]

  1. CHECK FOR INTERMITTENT PROBLEMS Perform a simulation test. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - ]»(ref-644130-S29851213432014072300000) For the simulation test, reproduce the driving conditions that were present when the problem occurred. These conditions should be based on the customer's comments and freeze frame data that is recorded with DTCs, such as the opening angle of the accelerator pedal, SOC (state of charge), engine coolant temperature, engine speed, and generator (MG1) / motor (MG2) RPM and torque. Check the connector(s) and terminal(s). Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE [02/2014 - ]»(ref-644130-S10128349732014072300000) Wiggle the harness and connector(s). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - ]»(ref-644130-S29851213432014072300000) Heat or cool suspected parts. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - ]»(ref-644130-S29851213432014072300000)