CUSTOMER PROBLEM ANALYSIS
HINT
- In troubleshooting, the problem symptoms must be confirmed accurately and all preconceptions must be cleared in order to give an accurate judgment. To ascertain what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions when it occurred.
- The following 5 items are important points in the problem analysis. Past problems which are thought to be unrelated and the repair history, etc. may also help in some cases. So as much information as possible should be gathered and its relationship with the problem symptoms should be correctly ascertained for a reference in troubleshooting. A customer problem analysis table is provided in the Diagnostics information for each system for your use.
Important Points in the Customer Problem Analysis
- What---Vehicle model, system name
- When---Date, time, occurrence frequency
- Where---Road conditions
- Under what conditions?---Running conditions, driving conditions, weather conditions
- How did it happen?---Problem symptoms
(Sample) Supplemental restraint system check sheet.
Scheme 51
GLOSSARY OF SAE AND LEXUS TERMS
This glossary lists all SAE-J1930 terms and abbreviations used in this information in compliance with SAE recommendations, as well as their LEXUS equivalents.
| SAE ABBREVIATIONS | SAE TERMS | LEXUS TERMS ( )-ABBREVIATIONS |
|---|---|---|
| A/C | Air Conditioning | Air Conditioner |
| ACL | Air Cleaner | Air Cleaner, A/CL |
| AIR | Secondary Air Injection | Air Injection (Al) |
| AP | Accelerator Pedal | |
| B+ | Battery Positive Voltage | +B, Battery Voltage |
| BARO | Barometric Pressure | HAC |
| CAC | Charge Air Cooler | Intercooler |
| CARB | Carburetor | Carburetor |
| CFI | Continuous Fuel Injection | |
| CKP | Crankshaft Position | Crank Angle |
| Cl | Closed Loop | Closed Loop |
| CMP | Camshaft Position | Cam Angle |
| CPP | Clutch Pedal Position | |
| CTOX | Continuous Trap Oxidizer | |
| CTP | Closed Throttle Position | LL ON, Idle ON |
| DFI | Direct Fuel Injection (Diesel) | Direct Injection (D/INJ) |
| Dl | Distributor Ignition | |
| DLC1 DLC2 DLC3 | Data Link Connector 1 Data Link Connector 2 Data Link Connector 3 | 1: Check Connector 2: Total Diagnosis Communication Link (TDCL) 3: OBD II Diagnostic Connector |
| DTC | Diagnostic Trouble Code | Diagnostic Trouble Code |
| DTM | Diagnostic Test Mode | |
| ECL | Engine Control Level | |
| ECM | Engine Control Module | Engine ECU (Electronic Control Unit) |
| ECT | Engine Coolant Temperature | Coolant Temperature, Water Temperature (THW) |
| EEPROM | Electrically Erasable Programmable Read Only Memory | Electrically Erasable Programmable Read Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM) |
| EFE | Early Fuel Evaporation | Cold Mixture Heater (CMH), Heat Control Valve (HCV) |
| EGR | Exhaust Gas Recirculation | Exhaust Gas Recirculation (EGR) |
| EI | Electronic Ignition | Distributorless Ignition (DLI) |
| EM | Engine Modification | Engine Modification (EM) |
| EPROM | Erasable Programmable Read Only Memory | Programmable Read Only Memory (PROM) |
| EVAP | Evaporative Emission | Evaporative Emission Control (EVAP) |
| FC | Fan Control | |
| FEEPROM | Flash Electrically Erasable Programmable Read Only Memory | |
| FEPROM | Flash Erasable Programmable Read Only Memory | |
| FF | Flexible Fuel | |
| FP | Fuel Pump | Fuel Pump |
| GEN | Generator | Alternator |
| GND | Ground | Ground (GND) |
| HO2S | Heated Oxygen Sensor | Heated Oxygen Sensor (HO2S) |
| IAC | Idle Air Control | Idle Speed Control (ISC) |
| IAT | Intake Air Temperature | Intake or Inlet Air Temperature |
| ICM | Ignition Control Module | |
| IFI | Indirect Fuel Injection Indirect | Injection (IDL) |
| IFS | Inertia Fuel-Shutoff | |
| ISC | Idle Speed Control | |
| KS | Knock Sensor | Knock Sensor |
| MAF | Mass Air Flow | Air Flow Meter |
| MAP | Manifold Absolute Pressure | Manifold Pressure Intake Vacuum |
| MC | Mixture Control | Electric Bleed Air Control Valve (EBCV) Mixture Control Valve (MCV) Electric Air Control Valve (EACV) |
| MDP | Manifold Differential Pressure | |
| MFI | Multiport Fuel Injection | Electronic Fuel Injection (EFI) |
| MIL | Malfunction Indicator Lamp | Check Engine Lamp |
| MST | Manifold Surface Temperature | |
| MVZ | Manifold Vacuum Zone | |
| NVRAM | Non-Volatile Random Access Memory | |
| O2S | Oxygen Sensor | Oxygen Sensor, O2 Sensor (O2S) |
| OBD | On-Board Diagnostic | On-Board Diagnostic System (OBD) |
| OC | Oxidation Catalytic Converter | Oxidation Catalyst Convert (OC), CCo |
| OP | Open Loop | Open Loop |
| PAIR | Pulsed Secondary Air Injection | Air Suction (AS) |
| PCM | Powertrain Control Module | |
| PNP | Park/Neutral Position | |
| PROM | Programmable Read Only Memory | |
| PSP | Power Steering Pressure | |
| PTOX | Periodic Trap Oxidizer | Diesel Particulate Filter (DPF) Diesel Particulate Trap (DPT) |
| RAM | Random Access Memory | Random Access Memory (RAM) |
| RM | Relay Module | |
| ROM | Read Only Memory | Read Only Memory (ROM) |
| RPM | Engine Speed | Engine Speed |
| SC | Supercharger | Supercharger |
| SCB | Supercharger Bypass | E-ABV |
| SFI | Sequential Multiport Fuel Injection | Electronic Fuel Injection (EFI), Sequential Injection |
| SPL | Smoke Puff Limiter | |
| SRI | Service Reminder Indicator | |
| SRT | System Readiness Test | |
| ST | Scan Tool | |
| TB | Throttle Body | Throttle Body |
| TBI | Throttle Body Fuel Injection | Single Point Injection Central Fuel Injection (Ci) |
| TC | Turbocharger | Turbocharger |
| TCC | Torque Converter Clutch | Torque Converter |
| TCM | Transmission Control Module | Transmission ECU, ECT ECU |
| TP | Throttle Position | Throttle Position |
| TR | Transmission Range | |
| TVV | Thermal Vacuum Valve | Bimetallic Vacuum Switching Valve (BVSV) Thermostatic Vacuum Switching Valve (TVSV) |
| TWC | Three-Way Catalytic Converter | Three-Way Catalytic (TWC) Manifold Converter CC RO . |
| TWC+OC | Three-Way + Oxidation Catalytic Converter | CCr + CCo |
| VAF | Volume Air Flow | Air Flow Meter |
| VR | Voltage Regulator | Voltage Regulator |
| VSS | Vehicle Speed Sensor | Vehicle Speed Sensor |
| WOT | Wide Open Throttle | Full Throttle |
| WU-OC | Warm Up Oxidation Catalytic Converter | |
| WU-TWC | Warm Up Three-Way Catalytic Converter | |
| 3GR | Third Gear | |
| 4GR | Fourth Gear |
GLOSSARY OF SAE AND LEXUS TERMS